RRB NTPC Mains or Stage 2 Model Paper 2 with solutions

Question : 32 of 120

Marks: +1, -0

A water tank has two holes. The 1st hole alone empties the tank in 8 minutes and

2^n^d

hole alone empties the tank in 12 minutes. If water leaks out at a constant rate, how many minutes will it take, if both the holes together empty the tank?

$4 /5$
$4 4/ 5$
$4 3 /5$
$2 4/ 5$

Validate

Solution:

(b) First hole can empty a tank in 8 minutes.
Second hole can empty a tank in 12 minutes.
If both holes together empty the tank.

⇒1/8+ 1/12= {3+ 2} /24=5/24

⇒ = 24/5

=min.

4 4=5

= minutes.

Go to Question:

Prev Question

Next Question