A can complete a task in 10 days. He worked for 4 days and then stopped. B completed the remaining work in 9 days. In how many days can A and B together complete the task?
Let Total Work = 20 unit
Work done by A in 10 days
Efficiency of A =
Work done by A in 4 days = 2× 4 = 8 unit
Reamining work = 20-8 = 12 unit
It has to be completed by B in 9 days
Efficiency of B =
Total time taken by both of them together to complete the whole work =
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