Multiple choice

A and B can do a piece of work in 40 days and 60 days respectively. If they work on alternate days, find the time in which the work will be finished (if the work is started by B).

  1. 24

  2. 36

  3. 48

  4. 52
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Work done by A in 1 day = 1/40, by B = 1/60. They work alternately starting with B. In 2 days, work done = 1/60 + 1/40 = 5/120 = 1/24. In 48 days (24 cycles), work completed = 24/24 = 1. Total time = 48 days. Option C is correct.

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