SOLUTION: Jerry washes his car in 2 hours 15 minutes. His son Timmy can wash the same car in 1 hour 25 minutes. How long it takes if they work togather?
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-> SOLUTION: Jerry washes his car in 2 hours 15 minutes. His son Timmy can wash the same car in 1 hour 25 minutes. How long it takes if they work togather?
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Question 1014402: Jerry washes his car in 2 hours 15 minutes. His son Timmy can wash the same car in 1 hour 25 minutes. How long it takes if they work togather? Found 2 solutions by ikleyn, MathTherapy:Answer by ikleyn(52788) (Show Source):
You can put this solution on YOUR website! .Jerry washes his car in 2 hours 15 minutes. His son Timmy can wash the same car in 1 hour 25 minutes. How long it takes if they work togather?
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Jerry's rate is 1 : = 1 : = 1 : = = of the car per hour.
Timmy's rate is 1 : = 1 : = 1 : = of the car per hour.
When they work together, their rate is + = = of the car per hour.
So, it will take of an hour for Jerry and Timmy to wash the car working together.
You can put this solution on YOUR website! Jerry washes his car in 2 hours 15 minutes. His son Timmy can wash the same car in 1 hour 25 minutes. How long it takes if they work togather?
Jerry takes , or hours to wash car
Therefore, Jerry can do , or of car in 1 hour
Iimmy takes , or hours to wash car
Therefore, Timmy can do , or of car in 1 hour
We then get:
176T = 153 ------- Cross-multiplying
T, or time both take: hr, or mins
