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AFCAT II 24 Aug 2019 Paper
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© examsnet.com
Question : 18
Total: 100
A can finish a work in 20 days. A works for 5 days and leave,then B finish the remaining work in 10 days. How much timewill be required to do the work if both A and B work together?
7 days
8 days
8.5 days
9 days
Validate
Solution:
👈: Video Solution
Amount of work done by A in 5 days
=
5
20
=
1
4
Remaining work =
1
−
1
4
=
3
4
work
3
4
work is done by B in 10 days
∴ whole work is done by B is
=
10
×
4
3
days
=
40
3
days
Time require to complete whole work by A and B together
20
×
40
3
20
+
40
3
=
20
×
40
×
3
3
×
(
60
+
40
)
=
8
days
© examsnet.com
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