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? Choose the correct choice from the following:
A) 11
B) 8
C) 12
D) 99
E) 17
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?