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SSC CGL Model Paper 18
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© examsnet.com
Question : 52
Total: 100
A and B have to type a book together containing 120 pages. A takes 9 hrs to type 36 pages and B takes 5 hrs to type 40 pages. A typed first 60 pages alone and the last 60 pages were typed by A and B together. How much time (in hours) will be taken to type the complete book ?
24
20
12
15
Validate
Solution:
A types in 1 hour
=
36
9
=
4
pages
B types in 1 hour =
40
5
=
8
pages
A types first 60 pages
=
60
4
=
15
hours
A and B together type last 60 pages =
60
4
+
8
=
5
hours
∴ Required time = 15 + 5 = 20 hours
© examsnet.com
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