The distance between PQ is 203 km. two boats A and B start moving towards each other at the same time from point P and Q

The distance between PQ is 203 km. two boats A and B start moving towards each other at the same time from point P and Q respectively. B is upstream and other is downstream. If speed of A and B in still water is 11.4km/hr. and 17.6km/hr. respectively. Then in how much time they will meet.

a) 4hr

b) 5hr

c) 6hr

d) 7hr

Sol:

Speed of current = x Relative speed = (11.4 + x) + (17.6 – x)

= 29.

Time=203/29=7 hr.