DRDO Multi tasking staff Model paper 7

(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