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Time and work

Time and Work
(Question1)A can do a piece of work in 5 days and B can do the same work in 10 days.In how many days work should be complete if he work together.
10/3
3/10
3/20
2(10/3)
(Question 2) Ramesh can do a piece of work in 10 days and Mohan can do the same piece of work in 15 days.How long will they take to do it together?
6 days
8 days
4 days
3.33 days
(Question 3)A,B and C together complete a work in 4 days.A alone can do the same work in 12 days and C alone can do the work in 10 days.How long will B alone can do the work?
18 days
20 days
15 days
12 days


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