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Question

Worker A takes 8 hours to do a job. Worker B takes 10 hours to do the same job. How long should it take both A and B, working together but independently, to do the same job?


  1. 50/9 hrs

  2. 4 hrs

  3. 60/9 hrs

  4. 40/9 hrs

  5. None of these


Solution

The correct option is D

40/9 hrs


A’s 1 hour’s work = 18

B’s 1 hour’s work = 110

(A+B)’s 1 hour’s work  = (18+110)=940

∴ Both A and B together will finish the work in  409hours.

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