The ratio between the speeds of two trains is 7 : 8. If the second train runs 400 kms in 4 hours, then the speed of the first train is:

# The ratio between the speeds of two trains is 7 : 8. If the second train runs 400 kms in 4 hours, then the speed of the first train is:

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## Dheeru8089

Total time taken = (160/64 + 160/80 hrs. = 9/2 hrs.

Average speed = (320 x 2/9) km/hr = 71.11 km/hr.