The distance between delhi and agra is 200 km. a train travels the first 100 km at a speed of 50km/h. how fast must the train travel the next 100 km, so as to average 70 km/h for the whole journey
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Total distance between Delhi and Agra = 200 km
Travelled distance = 100 km
Speed during first 100 km = 50 km/hr
Remaining distance = 70 km/hr
Average speed should be = 70 km/hr
ATQ,
(50+x)/2 = 70
50/2 + x/2 = 70
25 + x/2 = 70
x/2 = 70 - 25 = 45
x = 45 × 2 = 90
Therefore, The speed of the train during next 100 km should be 90 km/hr
Travelled distance = 100 km
Speed during first 100 km = 50 km/hr
Remaining distance = 70 km/hr
Average speed should be = 70 km/hr
ATQ,
(50+x)/2 = 70
50/2 + x/2 = 70
25 + x/2 = 70
x/2 = 70 - 25 = 45
x = 45 × 2 = 90
Therefore, The speed of the train during next 100 km should be 90 km/hr
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