Multiple choice

A, B and C can complete of piece of work in 10,20 and 60 days respectively. Working together, they can complete the same work in how many days ?

  1. 6

  2. 10

  3. 5

  4. 8
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A's rate = 1/10 work per day, B's rate = 1/20 work per day, C's rate = 1/60 work per day. Combined rate = 1/10 + 1/20 + 1/60 = 6/60 + 3/60 + 1/60 = 10/60 = 1/6 work per day. Therefore, time to complete the work together = 1/(1/6) = 6 days.

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