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IBPS RRB Officer Prelims 09 Sep 2017 Shift 2 Paper
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© examsnet.com
Question : 41
Total: 80
The respective ratio of the time taken by A and B individually to finish a piece of work is 5 : 4. The respective ratio of the time taken by B and C individually to finish the same piece of work is 4 : 3. If A and C together can finish the same piece of work in
11
1
4
days, in how many days can B alone finish the same piece of work?
28
16
20
32
24
Validate
Solution:
(5) Ratio of the time taken byeach of A, B and C in doing 1work = 5 : 4 : 3
Time taken by A = 5x days
Time taken by C = 3x days
According to the question,
1
5
x
+
1
3
x
=
4
45
⇒
3
+
5
15
x
=
4
45
⇒
8
x
=
4
3
⇒ 4x = 8 × 3
⇒
x
=
8
×
3
4
=
6
∴ Time taken by B = 6 × 4
= 24 days
© examsnet.com
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