- A18 min
- B6 min
- C9 min
- D36 min
Step-by-Step Solution
Lap times: min, min, min. LCM(6, 4.5, 3) = LCM of 12, 9, 6 half-minutes = 36 half-minutes = 18 min.
Answer: A) 18 min
Three cyclists start together from one point of a 1.5 km track and ride the same way at 15 km/h, 20 km/h and 30 km/h. After how many minutes are all three first together at the starting point?
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