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HKIMO 2026 Grade 9 National Preliminary Set 02 Question 2

HKIMO · HKIMO 2026 Grade 9 National Preliminary Set 02

Question 2

A train travels at 80 km/h and a car travels at 40 km/h in the opposite direction. The car takes 30 seconds to pass the train completely. Find the train length in metres.

Editorial modelling note: as intended by the source options, neglect the car’s length.
  1. 1100 m
  2. 800 m
  3. 1200 m
  4. 1000 m