SOLUTION: jason can wash and wax his car in 4 hours. His younger sister can wash and wax the same car in 6 hours. working togther how fast can they wash and wax the car?
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Question 720079: jason can wash and wax his car in 4 hours. His younger sister can wash and wax the same car in 6 hours. working togther how fast can they wash and wax the car? Answer by god2012(113) (Show Source):
You can put this solution on YOUR website! Work done by Jason in 1 hr = 1/4
Work done by his sister in 1 hr = 1/6
work done by both in 1 hr = 1/4 + 1/6 = 5/12 = 1/(12/5)
Therefore , time taken to complete the work by both together = 12/5 hrs
