Question

A truck drove 1400 miles at a rate twenty miles per hour slower on the return trip. If the trip took 22 hours total, how fast was the truck going on the return trip? Round your answer to the nearest hundredth.

Answer 1

r mi/h When leaving.
(r-20)mi/h When returning.

(r + (r-20))22 = 1400 mi.
r + 22r-440 = 1400
23r = 1400+440 = 1840
r = 80 mi/h
r-20 = 80-20 = 60 mi/h. = Speed on return trip.