Question

Mrinal can complete a piece of work in 4 days and Surabhi can complete the same work
in 5 days. How many days will they need if they work together? Give your answer in
days, hours and minutes

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Answer 1

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