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It takes Ginny's motor boat?
It takes Ginny's motor boat 4 hours to travel downstream 20 miles and 2 hours to travel 2 miles upstream from her camp. What is the average speed of the current?
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- BattleaxeLv 77 years agoFavorite Answer
4(s + c) = 20 or 4s + 4c = 20
2(s - c) = 2 or 2s - 2c = 2 or s = 2 + c
substitute second equation into first equation:
4(2 + c) + 4c = 20
8 + 4c + 4c = 20
8c = 12
c = 12/8 = 1.5 mi/hr
The current speed is 1.5 miles per hour.
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