Excluding stoppages, the speed of a train is 45 kmph and including stoppages it is 34 kmph. Of how many minutes does the train stop per hour?
Choose the correct choice from the following answers
A) 73  B) 15  C) 12  D) 83  E) 28
Explanation:   T = 11/45 * 60 = 15   Answer: Option 15
<result>B</result>
Excluding stoppages, the speed of a train is 45 kmph and including stoppages it is 34 kmph. Of how many minutes does the train stop per hour?