SOLUTION: It takes a man 5 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?

Algebra ->  College  -> Linear Algebra -> SOLUTION: It takes a man 5 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?      Log On


   

Question 1154636: It takes a man 5 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 josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
u, the time for the son alone

1%2F5%2B1%2Fu=1
-
1-1%2F5=1%2Fu
5%2F5-1%2F5=1%2Fu
4%2F5=1%2Fu
u=5%2F4

highlight%28u=1%261%2F4%29hour