Excluding stoppages, the speed of a bus is 80 kmph and including stoppages, it is 60 kmph. For how many minutes does the bus stop per hour?
in 1 hour bus run for 60 km including stoppage.
So, Bus will run at 80 km/h speed for =$$\frac{60}{80}\times60=45\ \min\ .$$
So, in 1 hour it will definitely stop for =60-45=15 mins .
B is correct choice.
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