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Q.

Without stoppages a train travels a certain distance at an average speed of 80 kmph and with stoppages it covers the same distance with an average speed of 40 kmph. What is the time in minutes per hour for which train stops ?

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a

30 min/hr

b

none 

c

20 min/hr

d

15 min/hr 

answer is A.

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Detailed Solution

Average speed of  train reduced to half speed. Then the train will take half an hour to every hour.

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