Question

distance between Delhi and Agra is 200 km A train travels the first hundred km at a speed of 50 km per hour how fast must the train travel the next hundred km was the average of 70 km per hour for a journey

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Answer 1

Answer:

Also let the speed of the train while covering the second \[100km\] be \[S\] . Hence, the train needs to travel with a speed of \[116.66km/h\] during the second half of the travel to make the average speed of the train \[70km/h\] .

Answer 2

Explanation:

Time taken to travel first half distance = 100/ 50 = 2 hrs

Time is taken to travel second half distance = 100/v

Average speed = 200/ (2 + 100/v)

70 = 200/ (2 + 100/v)

2 + 100/v = 20/7

100/v = 20/7 – 2 = 6/7

v = 100 * 7/6 Km/h

v = 700/6 km/h