Question 1197124
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Informally....<br>
The distances going and returning are the same, and the ratio of the speeds is 160:120 = 4:3; that means the ratio of the times at the two speeds is 3:4.<br>
Then, since the total time was 7 hours, that means he spent 3 hours at 160mph on the way there and 4 hours at 120mph on the way back.<br>
ANSWER: round trip distance = 160*3 + 120*4 = 480+480 = 960 miles<br>