jwednesday
New member
- Joined
- Dec 10, 2009
- Messages
- 16
Bob can do a certain maintenance job in 1.5 hours. It takes Jim 2.5 hours to do the same job. Bob had been working on the job for half an hour when he was called to a more important job and Jim took over. How many hours did it take Jim to finish the job?
I think it goes as follows ... Bob x - 0.5 over 1.5 Jim is x over 2.5
1.5 (x - 0.5) + x = 1 1.5x - 1.125 + 1.2x = 3 2.7x = 4.125 x = 1.527
-------------- --- --------------- --------- --- ------ -------
1.5 2.5 1.5 2.5 3 2.7 2.7
Not sure I did this right the answer is suppose to be 1 and 2/3 hours
I think it goes as follows ... Bob x - 0.5 over 1.5 Jim is x over 2.5
1.5 (x - 0.5) + x = 1 1.5x - 1.125 + 1.2x = 3 2.7x = 4.125 x = 1.527
-------------- --- --------------- --------- --- ------ -------
1.5 2.5 1.5 2.5 3 2.7 2.7
Not sure I did this right the answer is suppose to be 1 and 2/3 hours