For how many minutes does a bus stop per hour, if including the stoppages the bus travels at a speed of 67.96 kmph and excluding stoppages the speed of the bus is 81.57 kmph.

For how many minutes does a bus stop per hour, if including the stoppages the bus travels at a speed of 67.96 kmph and excluding stoppages the speed of the bus is 81.57 kmph. Correct Answer 10.011

From the question it’s known that the bus travels at a speed of 67.96 kmph including stoppages and without stoppages 81.57 kmph.

So it’s very clear that some time is wasted due to decrease in speed of the bus

Decrease in speed of bus = 81.57 kmph – 67.96 kmph = 13.61 kmph

Every hour 13.61 km is wasted due to stoppages, we know that

Time = distance/speed

So if it would have travelled this 13.61 km with a speed of 81.57 kmph, it would have saved

⇒ 13.61/81.57 = 0.1668hrs = 10.011 minutes

∴ The bus stops 10.011 minutes per hour due to these stoppages.