Q. It takes two hours for a person X to mow the lawn. Y can mow the same lawn in four hours. How long (in minutes) will it take X and Y, if they work together to mow the lawn?
(A) 60
(B) 80
(C) 90
(D) 120
Ans: 80
Solution:
Work done by X in 1 hour=1/2
Work done by Y in 1 hour=1/4
Work done by X and Y together in 1 hour
=1/2+1/4=3/4
∴ Total time to complete mowing of lawn
=43 hour =43×60=80 min
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