the distance between Delhi and Agra is 200 km.a train travels the first 100 km at a speed of 50 km/h.how fast must the train travel the next 100 km,so as to average 70 km/h for the whole journey
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average speed =total distance / total time
let it takes x time to cover another 100km
70=200/(2+x)
x=6/7
speed=dis/time=100*7/6=350/3
=116.66
let it takes x time to cover another 100km
70=200/(2+x)
x=6/7
speed=dis/time=100*7/6=350/3
=116.66
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