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IBPS RRB Office Assistant 2018 Paper
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© examsnet.com
Question : 43
Total: 80
A alone can do a work in 40 days. The ratio of time taken by
A
and
B
to do the same work is
5
:
3
. Then, find in how many days both will complete the work together?
18 days
12 days
20 days
15 days
10 days
Validate
Solution:
Let, the time taken by A and B be
5
x
and
3
x
respectively.
According to the question,
Time taken by A to do the work
=
5
x
⇒ 40 = 5x
∴
x
=
8
Now, time taken by B to do the work
= 3 x 8 = 24 h
∵
(
A
+
B
)
's 1 day work
=
1
40
+
1
24
=
3
+
5
120
=
8
120
=
1
15
∴ Time taken to complete the work by both
=
1
1
15
=
15
days
© examsnet.com
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