The ratio between the speeds of two trains is 7 : 8. If the second train runs 400 km in 4 hours, then the speed of the first train is:
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4
let speed of first train=x
speed of second train=400/4=100km/hr
ratio=7:8=7/8
ATQ,
x/100=7/8
x=7×100/8
x=7×25/2
x=175/2
x=87.5km/hr
so, speed of first train=87.5km/hr
speed of second train=400/4=100km/hr
ratio=7:8=7/8
ATQ,
x/100=7/8
x=7×100/8
x=7×25/2
x=175/2
x=87.5km/hr
so, speed of first train=87.5km/hr
ReetChauhan1112:
hope it helped
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2
the speed of the first train is 87.5 km/hr
Let the speed of two trains be 7x and 8x km/hr.
Then, 8x =400/4= 100 x =100/8= 12.5Speed of first train = (7 x 12.5) km/hr = 87.5 km/hr.
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