Posted by **Devin** on Wednesday, March 30, 2011 at 12:36pm.

Charlie can grade exams in 2 hours. It takes Mark 6 hours to grade the same exams. If they work together, how long will it take for them to grade the exams?

- College Algebra -
**Devin**, Wednesday, March 30, 2011 at 12:51pm
I figured it out. 40 minutes. Thanks anyway

- College Algebra -
**Henry**, Thursday, March 31, 2011 at 9:55pm
1/T = 1/2 + 1/6,

1/T = 3/6 + 1/6,

1/T = 4/6 = 2/3,

T = 3/2 = 1.5HRS.

- College Algebra -
**chloe**, Thursday, May 26, 2011 at 11:14pm
Angela cam comlete a project in 2 hours. it takes Jason 3 hours to complete the same project. how long will it take for them to complete the project together?

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