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Boats & Streams, Pipes & Cisterns · Question 23 of 85

How long does the swimmer take to swim downstream?

Question 23

EasyOriginal question

A swimmer swims at 4 km/h in still water. In a river flowing at 2 km/h, she swims 3 km downstream and then swims back to where she started.

How long does the swimmer take to swim downstream?

Options for question 23

Show the answer and explanation
CorrectNot quiteAnswer A

Correct answer: A

Explanation

  1. Downstream speed =4+2=6= 4 + 2 = 6 km/h.

  2. 36=0.5\frac{3}{6} = 0.5 hour, 30 minutes.

Worth noting

45 minutes uses her still-water speed, 4 km/h.

Concept
Speed downstream
Typical time
90 s
Your time
—
The rule this testsJourneys on a river
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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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