SOLUTION: It takes a man 4 hours to wash and wax the family car. If his teenage son helps him, it only takes 1 hour. How long would it take the son, working alone, to wash and wax the car?

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Question 859160: It takes a man 4 hours to wash and wax the family car. If his teenage son helps him, it only takes 1 hour. How long would it take the son, working alone, to wash and wax the car?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Let x represent the son's time

 1/4 + 1/x = 1/1           |Multiplying thru by 4x so as all denominators = 1

  x + 4 = 4x    

      4/3 = x, the son's time, 1 1⁄3 hr 0r 1 hr 20min