The ratio between the speeds of two trains is 4 : 5. If the second train runs 800 km in 8 hours, then what is the speed of the first train?
A. 80 Km/h
B. 90 km/h
C. 70 km/h
D. 40 km/h
Sol;
Formula Used:
speed = distance/time
Let the speed of two trains be 4x and 5x respectively
⇒Speed of second train = 5x = 800/8
⇒ 5x = 100 km/hr
⇒ x = 20 km/hr
⇒ speed of first train = 4x = 20 × 4 = 80 km/h
∴ The speed of the first train = 80 km/h
