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paddycar | 11:18 Tue 06th Jun 2006 | Quizzes & Puzzles
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Dan can wash and wax his truck in 4 hours. Mike can do the same job in 3 hours. If they both work together how long will it take to wash and wax the truck
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1 hr 42 mins 51.43 secs


ie Dan washes 1/4 truck an hour, Mike 1/3


so together = 1/4+1/3 = 7/12 trucks an hour


so one truck takes 12/7 hrs

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