Without any stoppage, a person travels a certain distance at an average speed of 42 km/h, and with stoppages he covers the same distance at an average speed of 28 km/h. How many minutes per hour does he stop? Choose the correct choice from the following answers:
A) 14 minutes B) 15 minutes C) 28 minutes D) 38 minutes E) None of these
Let the total distance to be covered is 48 kms.   Time taken to cover the distance without stoppage = 48/42 hrs = 2 hrs   Time taken to cover the distance with stoppage = 48/28 = 3 hrs.   Thus, he takes 60 minutes to cover the same distance with stoppage.   Therefore, in 1 hour he stops for 20 minutes.   ANSWNone of theseR:None of these
<result>E</result>
Without any stoppage, a person travels a certain distance at an average speed of 42 km/h, and with stoppages he covers the same distance at an average speed of 28 km/h. How many minutes per hour does he stop?