SOLUTION: It takes Brian 15 hours longer to model a car than it takes John. If they work together, they can build the model car in 4 hours. How long does it take Brian to model the car on hi

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Question 1021285: It takes Brian 15 hours longer to model a car than it takes John. If they work together, they can build the model car in 4 hours. How long does it take Brian to model the car on his own?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39623) About Me  (Show Source):
You can put this solution on YOUR website!
PERSON(s)             RATE

Brian                 1%2F%2815%2Bx%29

John                  1%2Fx

Both Together         1%2F4

1%2F%28x%2B15%29%2B1%2Fx=1%2F4

Answer by MathTherapy(10555) About Me  (Show Source):
You can put this solution on YOUR website!

It takes Brian 15 hours longer to model a car than it takes John. If they work together, they can build the model car in 4 hours. How long does it take Brian to model the car on his own?
Brian's time, alone: highlight_green%28matrix%281%2C2%2C20%2C+hours%29%29