Question

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!

Answer 1

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