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Time, Speed & Distance · Question 60 of 71

Question 60

EasyOriginal question

A boat moves at 10 km/h in still water. The river flows at 2 km/h. How long will the boat take to travel 36 km downstream?

Options for question 60

Show the answer and explanation
CorrectNot quiteAnswer A

Correct answer: A

Explanation

  1. Downstream speed = 10+2=1210 + 2 = 12 km/h.

  2. Time =3612=3= \frac{36}{12} = 3 h.

Worth noting

3.6 h ignores the current; 4.5 h uses the upstream speed.

Concept
Downstream speed = boat speed + stream speed
Typical time
35 s
Your time
—
The rule this testsBoats and streams
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