- A60 s
- B50 s
- C40 s
- D70 s
Step-by-Step Solution
B runs 50 m in 10 s: 5 m/s, time 200 s; A takes 190 s. C runs 800 m while B runs 1000 m, so C's speed is 4 m/s and his time 250 s. A wins by s.
Answer: A) 60 s
Over 1 km, A beats B by 50 m or 10 seconds. In another 1 km race B beats C by 200 m. By how many seconds would A beat C over 1 km?
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