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Question

A works twice as fast as B. If B can complete a work in 24 days independently, the number of days in which A and B can together finish the work is?


  1. 12 days

  2. 8 days

  3. 6 days

  4. 9 days


Solution

The correct option is B

8 days


Given that B can complete the work in 24 days. 

Hence B's one day work = 124

Since A is twice as efficient as B, so A's one day work =2×124=112
The work completed by A and B in one day =124+112=1+224=324=18

Hence they can finish 18 work in one day.

A and B can together finish the work in 8 days.

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