Question

29.
3
A can do a job in 6 days. B is thrice as good a workman as C. If B is
good as A, then find the time in which they can do it working together?
as
30
persone working 7 hour​

Answer 1

Answer:

Option B

Explanation:

Ratio of times taken by A and B = 1 : 3.

The time difference is (3 - 1) 2 days while B take 3 days and A takes 1 day.

If difference of time is 2 days, B takes 3 days.

If difference of time is 60 days, B takes 3 x 60 = 90 days.

2

So, A takes 30 days to do the work.

A's 1 day's work = 1

30

B's 1 day's work = 1

90

(A + B)'s 1 day's work = 1 + 1 = 4 = 2

30 90 90 45

A and B together can do the work in 45 = 22 1 days