Homework Help: math

Posted by Kelly on Thursday, January 26, 2012 at 12:49pm.

Joe and Bob manufacture bikes. Joe can make 12 bikes in 8 hours while Bob can make 6 bikes in 12 hours. Working together how many hours will it take them to make 12 bikes?

Please explain showing steps so I can learn it. I don't just need the answer. Thanks!

math - Damon, Thursday, January 26, 2012 at 2:49pm
Joe 12 b/8 hr = 1.5 b/hr

Bob 6 b/12 hr = .5 b/hr

together 2 b/hr

2 b/hr * x hours = 12 b
x = 6 hours

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