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RRB NTPC Mains or Stage 2 Model Paper 6 with solutions
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© examsnet.com
Question : 32
Total: 119
A is 30% more efficient than B. How much time will they, working together, take to complete a job which A along could have done in 23 days?
11 days
13 days
20
3
17
days
None of these
Validate
Solution:
(b) Ratio of times taken by A and B = 100 : 130= 10 : 13.
Suppose B takes x days to do the work.Then, 10 : 13 : : 23 : x
⇒
x
=
[
23
×
13
10
]
⇒
x
299
10
.
A’s 1 day’s work =
1
23
;B’s 1 days work
=
10
299
.
(A + B)’s 1 day’s work
=
[
1
23
+
10
299
]
=
23
299
=
1
13
∴A and B together can complete the job in 13 days
© examsnet.com
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