SOLUTION: Mary takes 3 hours to complete a task. Mary and Jim together take 2 hours to complete the same task. How long will it take Jim to complete the task working alone?
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Question 121664: Mary takes 3 hours to complete a task. Mary and Jim together take 2 hours to complete the same task. How long will it take Jim to complete the task working alone? Answer by checkley71(8403) (Show Source):
You can put this solution on YOUR website! 3*j/(3+j)=2 cross multiply
3j=2(3+j)
3j=6+2j
3j-2j=6
j=6 hours for Jim to complete the task working alone.
proof
3*6/(3+6)=2
18/9=2
2=2
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