Multiple choice

A can do a work in 60 days. He worked for 15 days and B did the remaining work in 30 days. In how many days will they do that work?

  1. 24 days

  2. 25 days

  3. 30 days

  4. 32 days

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A's work rate = 1/60 per day. In 15 days, A completes 15/60 = 1/4 of work. Remaining work = 3/4. B does 3/4 work in 30 days, so B's rate = (3/4)/30 = 1/40 per day. Combined rate = 1/60 + 1/40 = 5/120 = 1/24 per day. Together they take 24 days. Option A is correct.

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