Discussion
Excluding stoppages, the speed of a bus is 30 kmph and including stoppages, it is 24 kmph. For how many minutes does the bus stop per hour?
Answer: C
The bus stops for 12 minutes per hour. The speed excluding stoppages is 30 kmph and including stoppages it is 24 kmph, so the bus loses \(30 - 24 = 6\) km each hour because of stoppages. The time to cover 6 km at 30 kmph is \[ \frac{6}{30}\text{ h} = 0.2\text{ h} = 12\text{ minutes} \] The other options 20, 15 and 8 minutes would need a speed loss of 10, 7.5 and 4 km per hour, which does not match the 6 km lost.
Equivalently, the bus runs 24/30 = 4/5 of each hour, so it is moving for 48 minutes and stopped for the remaining 12.
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