In a 100 m race, A beats B by 10 m, and A runs the race in 9 seconds. By how many seconds does A beat B?

0.9 secondsCorrect answerYour answer1 secondCorrect answerYour answer2 secondsCorrect answerYour answer10 secondsCorrect answerYour answer

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CorrectNot quiteAnswer B

Correct answer: B

In 9 seconds B runs 90 m, so B's speed is 10 m/s and B takes 10 seconds for 100 m.
A beats B by $10 - 9 = 1$ second.

Worth noting

0.9 seconds uses A's speed for B's last 10 m.

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

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

Explanation