Excluding the stoppages, the speed of a bus is 12 km/hr and including the stoppages the speed of the bus is 6 km/hr. For how many minutes does the bus stop per hour?  Choose the correct answer
A) 15 min
B) 30 min
C) 12 min
D) 20 min
E) 18 min
Speed of the bus without stoppage=12 km/hr   Speed of the bus with stoppage=6 km/hr   Difference in speed=6 km/hr   so,the time taken in the stoppages = time taken to cover 6 km=(6/12)hr = 1/2 hr =30 min   ANSWER:30 min
<result>B</result>
Excluding the stoppages, the speed of a bus is 12 km/hr and including the stoppages the speed of the bus is 6 km/hr. For how many minutes does the bus stop per hour?