- A48 km/h
- B50 km/h
- C45 km/h
- D52 km/h
Step-by-Step Solution
→ km. At 60 km/h it runs 4 h, so it starts at 11 a.m. To arrive at 4 p.m. it needs 5 h → 48 km/h. (50 km/h is the plain mean.)
Answer: A) 48 km/h
Running at 60 km/h a train arrives at 3 p.m.; at 40 km/h it arrives at 5 p.m. At what speed must it run to arrive at exactly 4 p.m.?
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