Discussion
With stoppage, the speed of a train is 36 km/hr. However without stoppage, it is 40 km/hr. Find out for how many minutes does the train stop per hour?
Answer: A
In one hour of clock time the train covers 36 km instead of 40, losing 4 km of travel.
\[ t = \frac{4}{40} \text{ h} = \frac{1}{10} \text{ h} = 6 \text{ minutes} \]
The lost distance is timed at the running speed of 40 km/hr, since that is the speed it would have been covered at.
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