A bus stops for taking passengers. The speed of the bus with stoppages is 36 km/hr and without stoppages is 45 km/hr.For how many minutes bus stopped per hour?
Answers: A) 10 min B) 11 min C) 12 min D) 13 min E) None of these
Explanation :   It takes 9 km less due to stoppages. Time spend in stoppages=(9/45)*60= 
<gadget id="calculator">(9/45)*60</gadget>
<output>12</output>
12 min   Answer : 12 min
<result>C</result>
A bus stops for taking passengers. The speed of the bus with stoppages is 36 km/hr and without stoppages is 45 km/hr.For how many minutes bus stopped per hour?