Alvin can go upstream at a rate of 6 miles per hour and downstream at a rate of 12 miles per hour. One day while Alvin was on the river, he received a call telling him he needs to turn around and come home. So he turned around and went back to his starting point. If his entire trip took 6 hours, how far did he travel on the river?

1. since time = distance/speed,

d/12 + d/6 = 6

posted by Steve

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