Excluding stoppages, the speed of a train is 45 kmph and including stoppages it is 36 kmph. Of how many minutes does the train stop per hour?	Choices:
A) 18	B) 77	C) 12	D) 99	E) 12
T = 9/45 * 60= 
<gadget id="calculator">9/45 * 60</gadget>
<output>12</output>
12   Answer:12
<result>C</result>
Excluding stoppages, the speed of a train is 45 kmph and including stoppages it is 36 kmph. Of how many minutes does the train stop per hour?