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Time, Speed & Distance · Question 27 of 71

Question 27

EasyOriginal question

Two friends stand 1.8 km apart on a straight road and walk towards each other at 4 km/h and 5 km/h. After how many minutes do they meet?

Options for question 27

Show the answer and explanation
CorrectNot quiteAnswer A

Correct answer: A

Explanation

  1. Closing speed = 4+5=94 + 5 = 9 km/h.

  2. Time =1.89=0.2= \frac{1.8}{9} = 0.2 h=12h = 12 min.

Worth noting

Using 9 km/h is essential: dividing by the difference 1 km/h gives 108 minutes.

Concept
Meeting time = distance ÷ sum of speeds
Typical time
40 s
Your time
—
The rule this testsRelative speed
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Ten questions from Time, Speed & Distance, at your own pace.

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