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Time, Speed & Distance · Question 26 of 71

Question 26

EasyOriginal question

A pickpocket running at 10 km/h is spotted by a constable 200 m behind him, who immediately gives chase at 12 km/h. How long does the constable take to catch him?

Options for question 26

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. Same direction: the constable gains at 12−10=212 - 10 = 2 km/h.

  2. Gap = 200 m=0.2m = 0.2 km. Time =0.22=0.1= \frac{0.2}{2} = 0.1 h=6h = 6 min.

Worth noting

Dividing 0.2 km by 12 km/h (1 min) forgets that the pickpocket is also running away.

Concept
Chasing: time to catch = gap ÷ difference of speeds
Typical time
45 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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Ten questions from Time, Speed & Distance, at your own pace.

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