Multiple choice

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 & B, working together but independently, to do the same job?

  1. 40/9

  2. 41/9

  3. 42/9

  4. 43/9
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A' s one hour work = 1/8 , B' s one hour work = 1/10 ( A + B )' s one hour work = ( 1/8 + 1/10 ) = 9/40 Both A & B will finish the work in  40/9 days 

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