Multiple choice

A train, 80 metres long, takes half a minute to cross a tunnel, 420 metres long. The speed of the train is

  1. 70 km/hr

  2. 65 km/hr

  3. 60 km/hr

  4. 46.5 km/hr

  5. 40 km/hr
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total distance = 80 + 420 = 500 m. Time = 0.5 minutes = 30 seconds. Speed = 500 / 30 = 50/3 m/s. Convert to km/h: (50/3) * (18/5) = 60 km/h.

AI explanation

To cross the tunnel, the train must cover a total distance equal to its own length plus the tunnel length, which is 80 + 420 = 500 meters. Using the formula speed = distance / time, the speed is 500 / 30 = 50 / 3 meters per second. To convert this to kilometers per hour, multiply by 18 / 5, resulting in (50 / 3) * (18 / 5) = 60 kilometers per hour.

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