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The distance between Delhi and agra is 200 km A train travel the first km at a speed of 50 km/h . How fast must the train travel the next km so as to average 70 km/h . for the whole journey???????
The distance between Delhi and agra is 200 km A train travel the first km at a speed of 50 km/h . How fast must the train travel the next km so as to average 70 km/h . for the whole journey???????
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The correct answer is :-
Average speed= (u+v)/2
70= (50 + v)/2
140= 50 + v
v=90 km/hr
Hope it helps you
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traveled by train.
t2=time taken to travel next 100km
∴70km/hr=200km/(2+t2)hours
70=200/2+t2
140+70t2=200
70t2=60
t2=60/70
t2=6/7 hours.
∴speed required by train to travel next 100km so as to attain 70km/h average speed is:
speed(v2)=distance/ time
=100km/6/7
=700/6
=116.67km/hr
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