Discussion
If in a race of 80m, A covers the distance in 20 seconds and B in 25 seconds, then A beats B by:
Answer: B
A finishes in 20 seconds. In that time B, who needs 25 seconds for 80 m, covers
\[ 80 \times \frac{20}{25} = 64 \text{ m} \]
\[ \text{A beats B by } 80 - 64 = 16 \text{ m} \]
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