Question

Please solve out.. ​

Answer 1

Answer:

Its below

Step-by-step explanation:

Speed = distance / time

Second train = speed = 400 / 4

= 100 km/hr

First train = 100 / 8*7 km/hr

= 87.5 km/hr

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Answer 2

let the speed of first train be7x

let the speed of second train be 8x

second train,

speed =distance/time

8x=400/4

x=100/8km/h

speed of first train = 100×7/8=87.5km/h