Question

1. A train covers 120 km at a uniform speed.
If its speed had been increased by 15 km/h,
it would have covered the distance in 40
minutes less. Find the original speed.​

Answer 1

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Let the speed of the train be X kmph.

The distance is 120 km.

Let the time taken to cover this distance be t hrs.

$x = \frac{120}{t}$

New speed = X + 15 kmph

New time = t - 2/3

$x + 15 = \frac{120}{t - \frac{2}{3} }$

Solving the equations, get the original speed.

Answer 2

Answer:

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