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 option:  A) 30 minutes  B) 28 minutes  C) 11 minutes  D) 17 minutes  E) 20 minutes
Let the total distance to be covered is 84 kms.   Time taken to cover the distance without stoppage = 84/42= 
<gadget id="calculator">84/42</gadget>
<output>2</output>
2 hrs   Time taken to cover the distance with stoppage= 84/28= 
<gadget id="calculator">84/28</gadget>
<output>3</output>
3 hrs.   Thus, he takes 60 minutes to cover the same distance with stoppage.   Therefore, in 1 hour he stops for 20 minutes.   Answer: 20 minutes
<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?