A can do (1/3) of a work in 5 days and B can do (2/5) of the work in 10 days. In how many days both A and B together can do the work?

73/4
84/5
93/8
10

Correct Answer: 93/8

Explanation:

∵ 1/3 of work is done by A in 5 days.
∴ Whole work will be done by A in 15 days.
∵ 2/3 of work is done by B in 10 days.
Whole work will be done by B in 10 x (5/2) i.e., 25days
∴ (A + B)'s 1 day's work = (1/15 + 1/25) = 8/75
So, both together can finish it in 75/8 days, i.e., 9³/₈days.

← Previous Question Next Question→

More Questions from Time and Work

A can do a piece of work in 20 days which B can do in 12 days. B worked at it for 9 days. A can finish the remaining work in?
A and B together can do a work in 8 days. If A alone can do it in 12 days, then in how many days can B alone do it?
Rohan and Sunil separately can complete a work in 8 hours and 4 hours respectively. How much time will they take when working together?
A can do a piece of work in 12 days. B is 60% more efficient than A. The number of days, it take B to do the same piece of work is?
A can finish a piece of work in 12 days while B can do it in 15 days. If both work at it together, what time will they take to do the work?
A can do a piece of work in 14 days while B can do it in 21 days. In how many days, working together they will complete the whole work?
A can do a piece of work in 24 days. If B is 60% more efficient than A, then the number of days required by B to do the same piece of work is?
A is twice as good a workman as B and together they finish a piece of work in 14 days. In how many days can a alone finish the work?
Ajit is 3 times as efficient as Bablu, then the ratio of number of days required by each to work alone, completely?
X is 4 times more efficient as Y , then the number of days taken by X and Y are in the ratio?

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion