Discussion
In a 100 m race, A beats B by 20 m. What is the ratio of their speeds ?
Answer: C
Correct answer: 5 : 4
In the time A covers 100 m, B covers only 80 m, and both run for the same length of time.
\[\text{Speed ratio} = 100 : 80 = 5 : 4\]
Speeds are in the ratio of the distances covered in equal times, which is why the beaten distance is subtracted from the full course.
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