Question

The ratio between the speeds of two train is 7:8. If the second trains runs 400km in 5 hours, find the speed of the first train.

Answer 1

Step-by-step explanation:

The Distance covered by 2nd train in 5 hours= 400 km

Therefore, distance covered by second train in 1 hr= 400÷5 = 80 km

since Speed = Distance÷ Time,

therefore the speed of 2nd train = 80km/hr

Ratio of the speed of both trains = 7:8

Let the speeds of both trains be 7x and 8x respectively

Since Speed of 2nd train = 80 km

Therefore, 8x= 80

Therefore x= 10

Hence, speed of first train= 7×x =7×10 = 70 km/hr

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