Bihar Police Constable Model Paper 1

Question : 8 of 100

Marks: +1, -0

Two pipes A and B can fill a tank in 15 hours and 18 hours, respectively. Both pipes are opened simultaneously to fill the tank. In how many hours will the empty tank be filled?

$8 2/{11}$
$7 2/{11}$
$9 2/{11}$
$10 2/{11}$

Validate

Solution:

Given:
Pipe A can fill in 15 hours.
Pipe B can fill in 18 hours.
Calculation:
Tank filled by Pipe A in 1 hour
⇒ 1/15
Tank filled by Pipe B in 1 hour
⇒ 1/18
Tank filled by both Pipes in 1 hour
⇒ (1/15) + (1/18)
⇒ 11/90
Time taken By both pipes to fill the tank
⇒ 90/11
⇒

8 2/{11}

hours
∴ Time taken by both pipes is

8 2/{11}

hours.

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