SOLUTION: It took John 12 hours riding his bike to make the round trip to his uncle's. If he averaged 20 mph out and 30 mph back, how long did he travel each way? (round answer to the neares

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: It took John 12 hours riding his bike to make the round trip to his uncle's. If he averaged 20 mph out and 30 mph back, how long did he travel each way? (round answer to the neares      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 614558: It took John 12 hours riding his bike to make the round trip to his uncle's. If he averaged 20 mph out and 30 mph back, how long did he travel each way? (round answer to the nearest tenth)
Found 2 solutions by richwmiller, scott8148:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
a=20x;
b=30y;
20x=30y
x+y=12
a = 144, b = 144, x = 36/5, y = 24/5
going 36/5=7.2 hours
returning 24/5=4.8 hours

Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
(d / 20) + (d / 30) = 12

multiplying by 60 (LCD) ___ 3d + 2d = 720