Question:
Mark (✓) against the correct answer:
6 pipes can fill a tank in 24 minutes. One pipe can fill it in
(a) 4 minutes
(b) 30 minutes
(c) 72 minutes
(d) 144 minutes
Solution:
(d) 144 minutes
Let one pipe take x min to fill the tank.
Clearly, one pipe will take more time to fill the tank.
So, it is a case of inverse proportion.
Now, $6 \times 24=1 \times x$
$\Rightarrow x=6 \times 24$
$\Rightarrow x=144$
∴ One pipe can fill the tank in 144 minutes.
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