- A180 s
- B90 s
- C900 s
- D95 s
Step-by-Step Solution
LCM(20, 30, 45) = 180 s. (95 s just adds the lap times; 90 s ignores the 20 s skater.)
Answer: A) 180 s
Three skaters take 20 s, 30 s and 45 s per lap of a rink. Starting together at the start line, after how many seconds are all three next at that line together?
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