A water tank can be filled by a pump in 3 hours. Due to a leak, it took 3(1/2) hours to fill the tank. How long can the leak drain all the water from the tank?

Correct answer marked below

8 hours

11 hours

15 hours

18 hours

21 hours

Correct

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Explanation

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Official Explanation

Official

Let the draining rate be x. It takes

\frac{7}{2}

hours to fill the tank with the leak. The hourly rate with the leak is

\frac{2}{7}

. The rate without the leak…

Comments

WayneAug 2, 2024

thanks!

What this question tests

Your fluency with the order of operations, fractions, decimals, and basic number sense — the foundation every quant question leans on.

Applying the order of operations out of sequence or rounding intermediate values before the final step.