SOLUTION: If two boys working together can complete a task in 2.5 hours and A working alone can complete that task in 10 hours, how many hours will B take in completing the task alone?

Algebra ->  Customizable Word Problem Solvers  -> Age -> SOLUTION: If two boys working together can complete a task in 2.5 hours and A working alone can complete that task in 10 hours, how many hours will B take in completing the task alone?       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 1145925: If two boys working together can complete a task in 2.5 hours and A working alone can complete that task
in 10 hours, how many hours will B take in completing the task alone?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
BOY          RATE task per hour
A              1/10
B               B
A&B            1/2.5


1%2F10%2BB=1%2F2.5
-
0.1%2BB=0.4
B=0.3
Time for boy B is 1%2F0.3=1%2F%283%2F10%29=10%2F3=highlight%283%261%2F3%29hours.