SSC CGL Model Paper 18

Question : 52 of 100

Marks: +1, -0

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 ?

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

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