39. The distance between Delhi and Agra is 200 km. A train travels the

1.	39. The distance between Delhi and Agra is 200 km. A train travels the first 100 km at a speed of 50 km/h. Howfast must the train travel the next 100 km, so as to average 70 km/h for the whole journey?
Answer» Answer: 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

39. The distance between Delhi and Agra is 200 km. A train travels the first 100 km at a speed of 50 km/h. Howfast must the train travel the next 100 km, so as to average 70 km/h for the whole journey?

Answer»

Answer:

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

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39. The distance between Delhi and Agra is 200 km. A train travels the first 100 km at a speed of 50 km/h. Howfast must the train travel the next 100 km, so as to average 70 km/h for the whole journey?​

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39. The distance between Delhi and Agra is 200 km. A train travels the first 100 km at a speed of 50 km/h. Howfast must the train travel the next 100 km, so as to average 70 km/h for the whole journey?