Multiple choice

Two trains are moving towards each other with speed of 25 km/hr and 83 km/hr, respectively. What will be the distance (in metres) between the trains 1 second before they collide?

  1. 32

  2. 35

  3. 30

  4. 40
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Relative speed = 25 + 83 = 108 km/hr. Convert to m/s: 108 * (5/18) = 30 m/s. In 1 second, the distance covered is 30 meters.

AI explanation

By the concept of relative speed, when two objects move towards each other, their speeds add up; therefore, the relative speed is 25 km/hr + 83 km/hr = 108 km/hr. To find the distance covered in the last second before collision, convert this relative speed to meters per second by multiplying by 5/18, which gives 108 * (5 / 18) = 30 m/s. Since 1 second is the time remaining before the collision, the distance between the trains is 30 meters.

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