A trip to another city is 180 miles. In miles per hour to the nearest tenth, how fast does one have to drive to average 60 mph on a three-hour trip during which one stops for 10 minutes? (Enter the answer in the form ab. c.)

63.5

Step-by-step explanation:

If one didn't take a 10 minute break he could drive 60 mph totalling 180 minutes but since he did and 180 - 10 = 170. He/she has to drive 180 miles in 170 min. so we take so we divde 180/170 and multiply by 60. If you round it to the nearest tenth you get 63.5