SOLUTION: Ronald can shovel the driveway in 6 hours, but if his brother Donald helps it would take 3 hours. How long, in hours and minutes, would it take Donald to shovel the driveway alone?

Algebra ->  College  -> Linear Algebra -> SOLUTION: Ronald can shovel the driveway in 6 hours, but if his brother Donald helps it would take 3 hours. How long, in hours and minutes, would it take Donald to shovel the driveway alone?      Log On


   

Question 1139732: Ronald can shovel the driveway in 6 hours, but if his brother Donald helps it would take 3 hours. How long, in hours and minutes, would it take Donald to shovel the driveway alone?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
1%2F6%2B1%2Fd=1%2F3

1%2Fd=1%2F3-1%2F6
1%2Fd=2%2F6-1%2F6=1%2F6
d=6
Also notice the amounts of time given. The two brothers together take half the time as either working alone. Both each work at one job in 6 hours.