Excluding stoppages, the speed of a train is 54 kmph and including stoppages it is 36 kmph. Of how many minutes does the train stop per hour? Select:  A) 20  B) 17  C) 15  D) 18  E) 12
T = 18/54 * 60= 
<gadget id="calculator">18/54 * 60</gadget>
<output>20</output>
20   20nswer: 20
<result>A</result>
Excluding stoppages, the speed of a train is 54 kmph and including stoppages it is 36 kmph. Of how many minutes does the train stop per hour?