SOLUTION: Fred shovels one sidewalk in four minutes, and John shovels one sidewalk in three minutes. How long will it take them to shovel a sidewalk if they work together?

SOLUTION: Fred shovels one sidewalk in four minutes, and John shovels one sidewalk in three minutes. How long will it take them to shovel a sidewalk if they work together?

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Question 567455: Fred shovels one sidewalk in four minutes, and John shovels one sidewalk in three minutes. How long will it take them to shovel a sidewalk if they work together?
Answer by nyc_function(2741) (Show Source): You can put this solution on YOUR website!
1/15 + 1/20 = 1/x

Solving for x we get 60/7 which is about 8.6 hours.
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