118. A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:

✅ The correct answer is option B.
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.

2
2