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 answer:	A) 12 min	B) 10 min	C) 11 min	D) 10 min	E) 17 min
12 min   12 min   T = 9/45 * 60= 
<gadget id="calculator">9/45 * 60</gadget>
<output>12</output>
12
<result>A</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?