Question

hey can solve this question.......

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???????​

Answer 1

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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Answer 2

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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