ram can do a piece of work i 12 days while mohan can do the same piece of work in 20 days. how long will it take to do the same piece of work.
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No. of days taken by Ram=12 days
Work done by Ram in a day=1/12
No. of days taken by Mohan=20 days
Work done by Mohan in a day=1/20
Work done by Ram & Mohan together in a day =1/12+1/20------------->5+3/60
8/60
No. of days taken by Ram & Mohan together=60/8------->7.50 days
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