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Time & Work · Question 47 of 61

Question 47

EasyOriginal question

A 1,200-litre tank is being filled at 40 litres per minute, but a leak lets out 10 litres per minute. How many minutes does the empty tank take to fill?

Options for question 47

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. Net inflow = 40−10=3040 - 10 = 30 litres per minute.

  2. Time = 1200÷30=401200 \div 30 = 40 minutes.

Worth noting

30 minutes ignores the leak, and 24 minutes adds the leak to the inflow.

Concept
Net flow in litres per minute
Typical time
40 s
Your time
—
The rule this testsPipes and cisterns
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Ten questions from Time & Work, at your own pace.

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Ten questions from Time & Work, at your own pace.

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