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SSC CPO Quantitative Aptitude Pipes and Cisterns Hard Practice Question

Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake

Shortcut used: Identify the quantity asked, write the given values, then apply the direct arithmetic formula.

Solve in 3 steps:

List the given numbers and units.
Choose the formula that matches the asked value.
Simplify carefully and compare with options.

Common mistake: Do not use a reasoning pattern shortcut in a quantitative question.

Question 1 Multiple Choice Question

Question

Two inlet pipes fill a tank in 12 hours and 18 hours, while an outlet empties it in 36 hours. How long will the tank take to fill when all three are open?

Explanation

Correct Answer: A

ANSWER

Correct Answer: A

Method / Topic: Pipes and Cisterns

The tank will fill in 9 hours.

Why this answer is correct

The answer follows from the arithmetic relation between the given values.

Short Explanation

The tank will fill in 9 hours.

Detailed Explanation

Question

Two inlet pipes fill a tank in 12 hours and 18 hours, while an outlet empties it in 36 hours. How long will the tank take to fill when all three are open?

ANSWER

Correct Answer: A

Method / Topic: Pipes and Cisterns

<table cellspacing="0" style="border-collapse:collapse; height:20px; width:85px">

<tbody>

<tr>

<td style="border-bottom:none; border-left:none; border-right:none; border-top:none; height:20px; vertical-align:top; white-space:normal; width:85px"><span style="color:#000000">Add both inlet rates and subtract the outlet rate. The net rate is 1/9 tank per hour, so time is 9 hours.</span></td>

</tr>

</tbody>

</table>

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Question 1

Hard Marks: 1.0 Practice Question

Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake

Shortcut used: Identify the quantity asked, write the given values, then apply the direct arithmetic formula.

Solve in 3 steps:

List the given numbers and units.
Choose the formula that matches the asked value.
Simplify carefully and compare with options.

Common mistake: Do not use a reasoning pattern shortcut in a quantitative question.

Question

Two inlet pipes fill a tank in 12 hours and 18 hours, while an outlet empties it in 36 hours. How long will the tank take to fill when all three are open?

Explanation

Correct Answer: A

ANSWER

Correct Answer: A

Method / Topic: Pipes and Cisterns

The tank will fill in 9 hours.

Why this answer is correct

The answer follows from the arithmetic relation between the given values.

Short Explanation

The tank will fill in 9 hours.

Detailed Explanation

Question

Two inlet pipes fill a tank in 12 hours and 18 hours, while an outlet empties it in 36 hours. How long will the tank take to fill when all three are open?

ANSWER

Correct Answer: A

Method / Topic: Pipes and Cisterns

<table cellspacing="0" style="border-collapse:collapse; height:20px; width:85px">

<tbody>

<tr>

<td style="border-bottom:none; border-left:none; border-right:none; border-top:none; height:20px; vertical-align:top; white-space:normal; width:85px"><span style="color:#000000">Add both inlet rates and subtract the outlet rate. The net rate is 1/9 tank per hour, so time is 9 hours.</span></td>

</tr>

</tbody>

</table>

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Pipes and Cisterns · Easy Q9939: A pipe fills two-fifths of a tank in 4 hours. At the same rate, how long will it take to … Pipes and Cisterns · Medium Q11015: One pipe fills a tank in 9 hours and another in 18 hours. What fraction of the tank do th… Pipes and Cisterns · Medium Q11143: An inlet fills a tank in 12 hours and an outlet empties it in 24 hours. What fraction of …

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