Question

Ntse MAT question A is 3 times more efficient than B. Hence, he takes 60 days less in painting a room. In how many days, work will be completed, if A and B both work together? (1) 30 days (2) 45 days (3) 22 1 2 days (4) 17 1 2 days

Answer 1

Let whole work done by A is in x days.
As A is 3 times more efficient than B , so time taken by B is 3x days.
As per the question,
3x - x = 60 days
x = 30 days.
So, time taken by B = 30*3 = 90 days
Now, time taken if both work together = 1/(1/30 + 1/90)
= 90/4
= 22 1/2 days.

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