Discussion
Excluding stoppages, the speed of a train is 45 kmph and including stoppages it is 36 kmph. Of how many minutes does the train stop per hour?
Answer: C
In one hour of clock time the train covers 36 km instead of 45, losing 9 km of travel.
\[ t = \frac{9}{45} \text{ h} = \frac{1}{5} \text{ h} = 12 \text{ minutes} \]
The lost distance is timed at the running speed of 45 kmph, since that is the speed it would have been covered at.
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