- A75 km/h
- B80 km/h
- C72 km/h
- D90 km/h
Step-by-Step Solution
At 60 km/h the trip should take 6 h. The first half used h, leaving 2 h for 180 km → 90 km/h. (75 km/h assumes averages of speeds work.)
Answer: D) 90 km/h
A train must cover 360 km. It runs the first 180 km at 45 km/h. At what speed must it cover the rest to average 60 km/h overall?
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