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Boats & Streams, Pipes & Cisterns · Question 15 of 85

Question 15

MediumOriginal question

A ferry goes downstream at 22 km/h and upstream at 14 km/h. What is the speed of the stream?

Options for question 15

Show the answer and explanation
CorrectNot quiteAnswer A

Correct answer: A

Explanation

  1. Downstream =b+s= b + s and upstream =b−s= b - s.

  2. ss is half their difference: 22−142=4.0\frac{22 - 14}{2} = 4.0 km/h.

Worth noting

8 km/h is the whole difference; it is twice the stream's speed.

Concept
Speed of the stream
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.

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

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