{"id":152991,"date":"2023-07-28T10:40:22","date_gmt":"2023-07-28T05:10:22","guid":{"rendered":"https:\/\/www.gkseries.com\/blog\/?p=152991"},"modified":"2023-07-28T10:40:24","modified_gmt":"2023-07-28T05:10:24","slug":"a-man-can-row-at-12-km-hr-in-still-water-he-finds-that-he-takes-twice-as-much-time-to-row-upstream-than-to-row-downstream-when-he-covers-a-certain-distance-find-the-speed-of-the-stream","status":"publish","type":"post","link":"https:\/\/www.gkseries.com\/blog\/a-man-can-row-at-12-km-hr-in-still-water-he-finds-that-he-takes-twice-as-much-time-to-row-upstream-than-to-row-downstream-when-he-covers-a-certain-distance-find-the-speed-of-the-stream\/","title":{"rendered":"A man can row at 12 km\/hr in still water. He finds that he takes twice as much time to row upstream than to row downstream when he covers a certain distance. Find the speed of the stream."},"content":{"rendered":"\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Question<\/td><td colspan=\"2\">A man can row at 12 km\/hr in still water. He finds that he takes twice as much time to row upstream than to row downstream when he covers a certain distance. Find the speed of the stream.<\/td><\/tr><tr><td>Type<\/td><td colspan=\"2\">multiple_choice<\/td><\/tr><tr><td>Option<\/td><td>4 km\/hr<\/td><td>correct<\/td><\/tr><tr><td>Option<\/td><td>3 km\/hr<\/td><td>incorrect<\/td><\/tr><tr><td>Option<\/td><td>4.5 km\/hr<\/td><td>incorrect<\/td><\/tr><tr><td>Option<\/td><td>3.5 km\/hr<\/td><td>incorrect<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Solution :<\/figcaption><\/figure>\n\n\n\n<p>As per the question, he takes twice the time when he rows upstream than rowing downstream.<\/p>\n\n\n\n<p>Time is inversely proportioned to speed. So he rows at twice the speed when moving along the stream than moving against the stream.<\/p>\n\n\n\n<p>Let his speed upstream = X km\/hr<\/p>\n\n\n\n<p>And, his speed downstream = 2X<\/p>\n\n\n\n<p>\u2234 Speed in still water = 1\/2 (2X+X) = 1.5 X km\/hr<\/p>\n\n\n\n<p>As per the question;<\/p>\n\n\n\n<p>1.5X = 12 km\/hr<\/p>\n\n\n\n<p>X = 120\/15 = <\/p>\n\n\n\n<p>8 km\/hr<\/p>\n\n\n\n<p>Speed upstream = 8 km\/hr<\/p>\n\n\n\n<p>So, speed downstream = 2 \u2217 8= 16 km\/hr Speed of current =\u00a01\/2 (speed downstream &#8211; speed upstream)<\/p>\n\n\n\n<p>= 1\/2 (16-8) <\/p>\n\n\n\n<p>= 1\/2 * 8 = 4 km\/hr<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Question A man can row at 12 km\/hr in still water. He finds that he takes twice as much time to row upstream than to row downstream when he covers a certain distance. Find the speed of the stream. Type multiple_choice Option 4 km\/hr correct Option 3 km\/hr incorrect Option 4.5 km\/hr incorrect Option 3.5 [&hellip;]<\/p>\n","protected":false},"author":984,"featured_media":152994,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[5138],"tags":[5139],"class_list":["post-152991","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-quantitative-aptitude","tag-quantitative-aptitude"],"_links":{"self":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts\/152991","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/users\/984"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/comments?post=152991"}],"version-history":[{"count":1,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts\/152991\/revisions"}],"predecessor-version":[{"id":152995,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/posts\/152991\/revisions\/152995"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/media\/152994"}],"wp:attachment":[{"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/media?parent=152991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/categories?post=152991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gkseries.com\/blog\/wp-json\/wp\/v2\/tags?post=152991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}