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Question

James can do a piece of work in 25 days and Kishan can finish it in 20 days. They work together for 5 days and then James leaves. In how many days will Kishan finish the remaining work?


  1. 10 days

  2. 12 days

  3. 11 days

  4. 13 days


Solution

The correct option is C

11 days


Time taken by James (say J) to finish the work = 25 days

J’s 1 day’s work = 125

Time taken by Kishan (say K) to finish the work = 20 days

K’s 1 day’s work = 120

(J + K)’s 1 day’s work = 125 + 120 = 9100

(J + K)’s 5 day’s work = 9×5100 = 920

Remaining work = 1 - 920 = 1120

Now, 120 work is done by K in 1 day

Therefore, 1120 work will be done by K in 11×2020 days = 11 days

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