By Ajay Kumar

Verified by Ajay Kumar

A can complete a task in 10 days and, B can finish a task in 15 days respectively. A starts the work and works for 4 days, after which B joins A. How many more days will they take to complete the task?

  1. 3.6 days

  2. 2.8 days

  3. 7.8 days

  4. 1.4 days

Answer: A

Solution

A's one-day work is \(\frac{1}{10}\). In 4 days, A completes \(\frac{4}{10}=\frac25\) of the work, leaving \(\frac35\). Their combined one-day work is \(\frac1{10}+\frac1{15}=\frac16\). Required additional time \(=\frac35\div\frac16=\frac35\times6=3.6\) days. Trick: Divide the remaining work by their combined daily work.

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