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OpenStudy (anonymous):
It takes a man 8 hours to wash and wax the family car. If his teenage son helps him, it only takes 5 hour(s). How long would it take the son, working alone, to wash and wax the car? @Calculus1
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OpenStudy (anonymous):
8 (rate of the man) = 5 (rate of the man + rate of his son) = 1 rate of the man = 1/8 rate of his son = 3/40 3/40 (time) = 1 time = 40/3 hour
OpenStudy (lilg132):
where did u get 40 from?
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