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Boats & Streams, Pipes & Cisterns · Question 6 of 85

What is the ferry's speed downstream between the jetties?

Question 6

EasyOriginal question

A ferry runs between two jetties 24 km apart on a river. It makes the trip downstream in 2 hours and the trip back upstream in 3 hours.

What is the ferry's speed downstream between the jetties?

Options for question 6

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. Downstream it covers 24 km in 2 hours.

  2. 242=12\frac{24}{2} = 12 km/h.

Worth noting

8 km/h is the upstream speed, 243\frac{24}{3}.

Concept
Speeds from distances and times
Typical time
90 s
Your time
—
The rule this testsUpstream and downstream speeds
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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.

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