SOLUTION: George drove to town at 50 mph and rove back home at 40 mph. What is the distance to town if the whole trip took 9 hours?

Question 465700: George drove to town at 50 mph and rove back home at 40 mph. What is the distance to town if the whole trip took 9 hours?
Found 2 solutions by jorel1380, Alan3354:
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
x/50+x/40=9
4x+5x=1800
9x=1800
x=200
The distance to town is 200 miles..
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Another approach:
The average speed for a round trip is similar to parallel resistors, but times 2.
Avg speed = 2*40*50/(40+50) = 4000/90 mph
r = 400/9 mph
t = 9 hours
d = (400/9)*9 = 400 miles round trip
--> 200 miles one way

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