Question

the distance between Delhi and Agra is 200 kilometre. A train travels the first 100 kilometre at a speed of 50 kilometre per hour how fast the train travel the next 100 kilometres so as to average 70 km per hour for the whole journey​

Answer 1

Distance between Delhi and Agra=200km

first 100km travel by train at speed=50km/h

so, time taken=100/50=2h

average speed of train=70km/h

so, time taken=200/70=20/7h

left time=20/7-2=6/7

left distance=100km

so,speed=100/(6/7)=116.66km/h