EduFarming
Your list · 0हिं

Type at least two letters. Press Esc to close.

↑↓ navigate↵ openTAB cycle filter

Boats & Streams, Pipes & Cisterns · Question 71 of 85

The pump is switched off when the tank is full.

Question 71

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.

The pump is switched off when the tank is full. How much water is left after the leak has run for 3 hours?

Options for question 71

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. In 3 hours the leak loses 3×150=4503 \times 150 = 450 litres.

  2. 1,800−450=1,3501{,}800 - 450 = 1{,}350 litres are left.

Worth noting

450 litres is what leaks away, not what is left.

Concept
Water lost to a leak
Typical time
90 s
Your time
—
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 chapterAll 85 questions in Boats & Streams, Pipes & CisternsRevise the notes for Boats & Streams, Pipes & Cisterns