The ratio between the speeds of two trains is 7:8. If the second train runs 400 km in 4 hours, what is the speed of the first train?
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Answer:
distance=400m
time=4hrs
speed =400/4
=100m/hr
ratio7/8
let speed of the first train be x
B. T. P
x/100=7/8
x=87.5
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