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RRB RPF RPSF SI and CONS Model Papers 8 with solutions
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© examsnet.com
Question : 54
Total: 120
A can do a piece of work in 12 days and B can do it in 18 days. They work together for 2 days and then A leaves. How long will B take to finish the remaining work ?
6 days
8 days
10 days
13 days
Validate
Solution:
(4) ∵ A in 12 days can do 1 work
∴ A in 1 day can do
1
12
work
A in 2 days can do
2
12
=
1
6
work
B in 18 days can do 1 work
∴ B in 1 day can do
1
18
work
B in 2 days can do
1
9
work
∴ Total work in two days
=
1
6
+
1
9
=
3
+
2
18
=
5
18
work
Hence, the remaining work
=
1
−
5
18
=
13
18
work
∵ B 1 work in 18 days
∴
B
13
18
work
13
18
×
18
= 13 days
© examsnet.com
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