SOLUTION: Isabel and Andy drove to the service station at a rate of 60 km per hour. They returned home by bicycle at a rate of 15 km per hour. The time for the entire trip took 4 hours. What

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Question 532805: Isabel and Andy drove to the service station at a rate of 60 km per hour. They returned home by bicycle at a rate of 15 km per hour. The time for the entire trip took 4 hours. What was the total distance for the round trip?
D R T
60x 60 x Car
15(4-x) 15 4-x Bike
60x=15(4-x)???? Doesn't work out!!!
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
t = d / r ___ the TOTAL time is 4 hr

4 = [(d / 2) / 60] + [(d / 2) / 15]

4 = (d / 120) + (d / 30)

480 = d + 4d