Distance covered in the first 2 hours = 60 km/h × 2 = 120 km. Distance covered in the next 3 hours = 80 km/h × 3 = 240 km. Distance covered in the next 4 hours = 50 km/h × 4 = 200 km. Total distance covered = 120 km + 240 km + 200 km = 560 km. Total time taken = 2 hours + 3 hours + 4 hours = 9 hours. Average speed = Total distance / Total time = 560 km / 9 hours = 62.22 km/h ≈ 62 km/h. Correct option: b
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