Multiple choice

A train of length 500 m passes through a tunnel of 1000 m in 1 minute. What is the speed of the train in km/hr?

  1. 75

  2. 87

  3. 90

  4. 96

  5. NA
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

To completely pass through the tunnel, the train must cover a total distance equal to the sum of its own length and the tunnel's length, which is 500 m + 1000 m = 1500 m. Since this distance is covered in 1 minute (60 seconds), the speed is 1500 / 60 = 25 m/s, which converts to 25 * 3.6 = 90 km/hr.

AI explanation

Using the formula for a train crossing a tunnel, the total distance covered is the sum of the train's length and the tunnel's length, which is 500 m + 1000 m = 1500 m. The time taken is 1 minute, so applying the speed formula gives a speed of 1500 m / 60 seconds = 25 m/s. To convert this to km/hr, multiply by 18/5, resulting in 25 * 18/5 = 90 km/hr.

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