Multiple choice general knowledge math & puzzles

In a 100m race, A can beat B by 10m, and C by 20m. If B and C run with the same velocity, By how many meters can B beat C in a 900 m race?

  1. 200 m

  2. 600 m

  3. 100 m

  4. 400 m
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When A runs 100 m, B runs 90 m and C runs 80 m, so the B:C speed ratio is 9:8. In a 900 m race, when B covers 900 m, C covers 900 x (8/9) = 800 m, so B beats C by 100 m. The phrase about B and C running at the same velocity is inconsistent with the data and can be ignored; the answer 100 m follows from the stated beat margins.

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