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Races & Games · Question 15 of 73

Question 15

MediumOriginal question

A runs 54\frac{5}{4} times as fast as B. By how many metres does A beat B in a 800 m race?

Options for question 15

Show the answer and explanation
CorrectNot quiteAnswer A

Correct answer: A

Explanation

  1. When A runs 800 m, B runs 800×45=640800 \times \frac{4}{5} = 640 m.

  2. A wins by 800−640=160800 - 640 = 160 m.

Worth noting

200 m takes 14\frac{1}{4} of the race; the margin is the 15\frac{1}{5} of A's 800 m that B has not covered.

Concept
A speed ratio as a margin
Typical time
90 s
Your time
—
The rule this testsBeating by a distance or a time
Practise this chapter →

Ten questions from Races & Games, at your own pace.

Practise this chapter →

Ten questions from Races & Games, at your own pace.