Multiple choice

Akash is 3 times as good a workman as Baldev and therefore is able to finish a job in 40 days less than Baldev. Working together, they can finish it in ______.

  1. 15 days

  2. 60 days

  3. 20 days

  4. 10 days
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If Akash is 3 times as fast as Baldev, the ratio of time taken is 1:3. Let Baldev take 3x and Akash take x. 3x - x = 40, so x = 20. Akash takes 20 days, Baldev takes 60. Together, they take (20*60)/(20+60) = 1200/80 = 15 days.

AI explanation

Since Akash is 3 times as efficient, the ratio of their times taken is 1:3, meaning Baldev takes 3x days and Akash takes x days. The difference is 2x = 40 days, so x = 20 days. Therefore, Akash takes 20 days and Baldev takes 60 days, making their combined one-day work (1/20) + (1/60) = 4/60 = 1/15. They finish the job in 15 days.

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