Excluding the halts, the speed of the bus is 50 km/ hr and including the halts it is 40 km/hr. For how many minutes does the bus stop per hour?
Due to stoppages, the bus will cover 10 km less.
Time taken to cover 10 km = $$\ \frac{10}{50}\times\ 60\ \min$$
=12 min
A is the correct answer.
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