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DRDO Multi tasking staff Model paper 7
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© examsnet.com
Question : 75
Total: 100
Three taps A, B and C together can completely fill a tank in 30 minutes. B and C together can fill the same tank in 45 minutes. In how much time (in minutes) A alone can fill the tank?
120
90
150
80
Validate
Solution:
(A + B + C) can fill a tank in = 30 min
∴ In 1 hour (A + B + C) can fill = 1/30
(B + C) can fill a tank in = 45 min
∴ In 1 hour (B + C) can fill = 1/45
∴ In 1 hour A can fill,
⇒
1
30
−
1
45
⇒
3
−
2
9
⇒ 1/90
∴ A can fill the tank in = 90 minutes
© examsnet.com
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