Excluding stoppages, the speed of a train is 45 kmph and including stoppages it is 35 kmph. Of how many minutes does the train stop per hour?	Choose the correct option.
A) 73	B) 83	C) 12	D) 13	E) 28
Explanation:   T = 10/45 * 60 = 13   Answer: Option 13
<result>D</result>
Excluding stoppages, the speed of a train is 45 kmph and including stoppages it is 35 kmph. Of how many minutes does the train stop per hour?