- A1 p.m.
- B12 noon
- C11 a.m.
- D2 p.m.
Step-by-Step Solution
At 10 a.m. B is 60 km ahead of C. C gains 20 km/h, so it needs 3 h → 1 p.m. (12 noon is when C passes A; 11 a.m. is when B passes A.)
Answer: A) 1 p.m.
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