Excluding stoppages, the speed of a bus is 50 kmph and including stoppages, it is 35 kmph.For how many minutes does the bus stop per hour?  Choose the correct choice from the following answers.
A) 17 minutes B) 18 minutes C) 19 minutes D) 16 minutes E) None of these
Explanation :   In one hour   Due to stoppages, it covers 15 km less.   Time taken to cover 15 km = [15/50 * 60= 
<gadget id="calculator">15/50 * 60</gadget>
<output>18</output>
18 min   Answer : 18 minutes
<result>B</result>
Excluding stoppages, the speed of a bus is 50 kmph and including stoppages, it is 35 kmph.For how many minutes does the bus stop per hour?