Your list · 0 हिं

Boats & Streams, Pipes & Cisterns · Question 80 of 85

At what rate does the leak lose water?

Question 80

MediumOriginal 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.

At what rate does the leak lose water?

150 litres an hourCorrect answerYour answer200 litres an hourCorrect answerYour answer450 litres an hourCorrect answerYour answer600 litres an hourCorrect answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer A

Correct answer: A

With the leak, the tank gains $\frac{1{,}800}{4} = 450$ litres an hour.
The leak takes $600 - 450 = 150$ litres an hour.

Worth noting

450 litres an hour is what is left after the leak, not the leak itself.

Concept: The rate of a leak
Typical timeTypical: 120 s
Your timeYours: —

The rule this testsOutlets and leaks

Practise this chapter →

Ten questions from Boats & Streams, Pipes & Cisterns, at your own pace.

Practise this chapter →

Ten questions from Boats & Streams, Pipes & Cisterns, at your own pace.

Practise this chapter All 85 questions in Boats & Streams, Pipes & Cisterns Revise the notes for Boats & Streams, Pipes & Cisterns