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RRB Non Technical Model Papers 6 with solutions
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© examsnet.com
Question : 36
Total: 100
A can do as much work as B and C together. A and B can together do a piece of work in 9 hours 36 minutes and C can do it in 48 hours. The time (in hours) that B needs to do the work alone is
18
24
30
12
Validate
Solution:
(2) (A+B)'s 1 hour's work
1
9
+
36
60
=
1
48
5
=
5
48
hours
C's 1 hour's work
=
1
48
(A+B+C)'s 1 hour's work
5
48
+
1
48
=
1
8
...........(1)
A's 1 hour's work = (B+C)'s 1 hour's work.........(2)
From equation (1) and (2)
2 × A's 1 hour's work
=
1
8
A's 1 hour's work
=
1
16
B's 1 hour's work
=
5
48
−
1
16
=
1
24
Therefore, B will finish the work alone in 24 hours.
© examsnet.com
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