SOLUTION: Josh and his dad can was the car 40 minutes. Josh can was it by himself in 70 minutes. How long would it take his dad to wash it by himself?
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Question 426415: Josh and his dad can was the car 40 minutes. Josh can was it by himself in 70 minutes. How long would it take his dad to wash it by himself? Answer by edjones(8007) (Show Source):
You can put this solution on YOUR website! 1/70 + x = 1/40
4+280x=7 multiply each side by 280.
280x=3
x=3/280 amount of the job his father can do in one minute.
280/3=93 1/3 minutes Length of time it takes father to do the job.
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Ed
