a train takes 40 minutes for a journey if it runs at 0.05 kilometre per second the rate at which the train must run to reduce the time to 28 minutes will be nearly
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Answer:
Initially :
The train speed = 0.05 km/s
time = 40min = 40 * 60 = 2400 sec
Hence the distance travel by train
D=speed * time
D=0.05 * 2400 = 120 km
When time is reduced :
Distance will remain unchanged
D=120 km
t=28 min = 28 * 60 =1680 Sec....
Hence
Speed = D/t
S=120 / 1680 = 0.0714 km/sec
Hope it helps you
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