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SSC CHSL 7-Jan-2017 Shift 3 Paper
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© examsnet.com
Question : 54
Total: 100
P and Q can do a project in 150 and 100 days respectively. In how many days can they complete 60% of the project if they work together?
12 days
72 days
42 days
36 days
Validate
Solution:
Let total project to be done = 300 units
P's efficiency =
300
150
= units/day
Q's efficiency =
300
100
= units/day
60% of the work =
60
100
×
300
= 180 units
(P + Q)'s 1 day's efficiency = 2 + 3 = 5 units/day
∴ Time taken by them to complete 60% of the work together =
180
5
=
36
days
© examsnet.com
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