SOLUTION: A trucker drove 72 miles to make a delivery and returned home on the same route. Because of foggy conditions, his average speed on the return trip was 25 mph less than his average

Algebra ->  Test -> SOLUTION: A trucker drove 72 miles to make a delivery and returned home on the same route. Because of foggy conditions, his average speed on the return trip was 25 mph less than his average       Log On


   

Question 921171: A trucker drove 72 miles to make a delivery and returned home on the same route. Because of foggy conditions, his average speed on the return trip was 25 mph less than his average speed going. If the return trip took 2 hours longer, how fast did he drive in each direction?
Answer by josgarithmetic(39613) About Me  (Show Source):
You can put this solution on YOUR website!
r, the unknown speed

_________________rate_________time_________distance
Deliver__________r____________t_____________72=rt
Return__________r-25__________t+2___________72=%28r-25%29%28t%2B2%29

A few arithmetic steps to solve the system of equations.