Problema Solution
A stunt driver was needed at the production site of a Hollywood movie. The average speed of the stunt driver's flight to the site was 160 mph, and the average speed of the return trip was 120 mph. Find the distance of the round trip if the total flying time was 7 h
Answer provided by our tutors
Let
v1 = 160 mph the speed of the flight to the site
v2 = 120 mph the speed of the return trip
t = the time of the flight to the site
7 - t = the time of the return trip
Since distance = speed*time and the distance traveled in each direction is the same we can write:
v1t = v2(7 - t)
160t = 120(7 - t)
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click here to see the equation solved for t
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t = 3 hr
v1*t = 160*3 = 480 mi
The distance of the round trip was 480 + 480 = 960 miles.