Question 114
DIRECTION for the question: Solve the following question and mark the best possible option.
Excluding stoppages, the speed of a train in 45 km/h and including stoppages, it is 36 km/h. For how many minutes does the train stop per hour?
Solution
For a fixed distance, ratio of speeds is inverse to the ratio of time taken.
So, the ratio of time with stoppages and without stoppages = 45 : 36 = 5:4 = 60 : 48.
For every 60 mins of trave time with stoppages, the train travelled without stoppages for 48 mins.
This means that the train stopes for 60 - 48 = 12 mins every hour.
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