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**Time and work**

Ratio of work done by A and B = 2:1

Ratio of time taken by A and B = 1:2.

The basic formula for solving work problems is 1/r + 1/s = 1/h where r and s are the number of hours it takes two people R and S respectively, to complete a job when working alone, and h is the number of hours it takes R and S to do the job when working together. 1/time 1 + 1/time 2 = 1/total time

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