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Question

Chase can do a job in 3hrs whereas Campbell can do the same job in 4hrs. If they work together, how long would it take them to finish the job?


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Solution

Solve for the required time:

Given that Chase can do a job in 3hrs whereas Campbell can do the same job in 4hrs.

Let the total work be L.C.M.3,4=12units

Work done by Chase in an hour =123=4units

Work done by Campbell in an hour =124=3units

Total work done by Chase and Campbell together in an hour =3+4=7units

Time taken by them to finish the job together =127=157hrs

Hence, it would take 157hrs to finish the job if they work together.


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