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 hundred km so as to average 70 km per hour for the whole journey ?
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70 = 200/(100/50 + 100/x)
2+ 100/x = 200/70
100/x = 20/7 -2
100/x=20-14/7
100/x=6/7
100×7/6=x
700/6=x
x=350/3
x=116 2/3 km/hr
2+ 100/x = 200/70
100/x = 20/7 -2
100/x=20-14/7
100/x=6/7
100×7/6=x
700/6=x
x=350/3
x=116 2/3 km/hr
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