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Boats & Streams, Pipes & Cisterns · Question 70 of 85

How much water does the pump deliver an hour?

Question 70

EasyOriginal question

A pump fills an empty 1,800-litre tank in 3 hours. A leak then develops at the bottom, and with the leak the pump takes 4 hours to fill the empty tank.

How much water does the pump deliver an hour?

150 litres an hourCorrect answerYour answer450 litres an hourCorrect answerYour answer600 litres an hourCorrect answerYour answer1,800 litres an hourCorrect answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer C

Correct answer: C

1,800 litres in 3 hours.
$\frac{1{,}800}{3} = 600$ litres an hour.

Worth noting

450 litres an hour is the net rate with the leak, $\frac{1{,}800}{4}$ .

Concept: Rates in litres
Typical timeTypical: 90 s
Your timeYours: —

The rule this testsOutlets and leaks

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