A can do a piece of work in 4 days and B can do the same work in 5 days.Find,How much work can be done by them working together in 2 days
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A can do work in = 4 days
1 day work by A = 1/4
B can do work in = 5 days
1 day work by B = 1/5
total work by A and B together in 1 day
1/4 + 1/5 = 9/20
work done by A and B in two days = 9/20 * 2 = 9/10
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