The distance between Delhi and Agra is 200km a train travels the first 100km at a speed of 50km/h how fast must the train travel the next 100km so as to average 70 km/h to the whole journey
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As we know that, average speed = Total distance / Total time taken
70 km/h = 200 km / total time
Total time = 20/7 h
Time take to complete the first half 100 km= 100/50 = 2 h
Time needed to cover the 2nd half 100 km= (20/7 -2) = 6/7 h
Therefore speed of the train with which it covers the 2nd half 100 km such that the average speed of the whole journey is equal to 70 km/h is,
Speed = 100/(6/7) = (100x7)/6 = 350/3 km/h
70 km/h = 200 km / total time
Total time = 20/7 h
Time take to complete the first half 100 km= 100/50 = 2 h
Time needed to cover the 2nd half 100 km= (20/7 -2) = 6/7 h
Therefore speed of the train with which it covers the 2nd half 100 km such that the average speed of the whole journey is equal to 70 km/h is,
Speed = 100/(6/7) = (100x7)/6 = 350/3 km/h
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