The distance between Kanpur and Prayagraj is 200 km. A train travels the first 100 km at a speed of 50 km/h.
How fast must the train travel the next 100 km , so as to average 80 km/h for the whole journey?
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Sorry I can't understand what you have written
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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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