- A90 s
- B75 s
- C135 s
- D15 s
Step-by-Step Solution
Both are at the start line at common multiples of their lap times: LCM(30, 45) = 90 s. (15 s is the HCF.)
Answer: A) 90 s
Lap times of two runners are 30 s and 45 s. They set off together from the start line in the same direction. When are they first together at the start line again?
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