ran can do a piece of work in 4 hrs and shyam can do the same work in 8 hrs. How log will the take to do the work jointly?
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Answer:Ram completes his work in 20 days.
He completes 1/20 th work in one day.
Shyam completes his work in 30 days.
He completes 1/30 th work in one day.
If both of them work together they can complete ( 1/20 + 1/30 ) th work in one day.
1/20 + 1/30 = 50/600 i.e. 8.3333% work completed in one day.
1 day : 8.3333% work = ? : 100% work
100/ 8.3333 = 12 days
So together, they can complete a piece of work in 12 days...
hope it helps uh...
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