Mike can do a piece of work in 60 hours. If he takes his son with him and both work together then the work is finished..

Mike can do a piece of work in 60 hours. If he takes his son with him and both work together then the work is finished in 40 hours. How many hours will the son take to do the same job, if he worked alone on the job?

A. 20

B. 60

C. 100

D. 120

E. 130

#gmat #gmatproblemsolving

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