Multiple choice

Harpal is thrice as good a workman as Kewal and takes $10$ days less to do a piece of work than Kewal takes, then Kewal can do that work in

  1. $8$ days
  2. $12$ days
  3. $13$ days
  4. $15$ days
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let Kewal take x days. Harpal takes x/3 days. Given x - x/3 = 10, so 2x/3 = 10, which means x = 15.

AI explanation

Since efficiency and time are inversely proportional, the ratio of their times taken is 1:3. The difference between their times is 2 parts, which corresponds to the given 10 days, making 1 part equal to 5 days. Kewal takes 3 parts of the time, so multiplying 3 by 5 days gives 15 days.

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