the distance between Delhi and Agra is 200 km a train travel the first 100 km at a speed of 50 km per hour how fast must the train travel the next 100 KM so as to average 70 km per hour for the whole journey?
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2 IS DIVIDED INTO TWO PARTS OF THE STUDENTS ARE GIRLS
ob25e:
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Hey user here is your answer
Time taken to travel first half distance = 100/ 50 = 2 hrs
Time 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
Hope you like it
Time taken to travel first half distance = 100/ 50 = 2 hrs
Time 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
Hope you like it
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