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.

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 

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