Multiple choice

Two boats are travelling with speed of 36 km/hr and 54 km/hr, respectively towards each other. What is the distance (in metres) between the two boats, one second before they collide?

  1. 10

  2. 15

  3. 25

  4. 5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Relative speed = 36 + 54 = 90 km/hr. Convert to m/s: 90 * (5/18) = 25 m/s. In 1 second, the distance covered is 25 meters.

AI explanation

Because the boats are moving towards each other, their relative speed is the sum of their individual speeds: 36 km/hr + 54 km/hr = 90 km/hr. To find the distance covered in one second, convert this relative speed to meters per second by multiplying by 5/18, which gives 90 * (5/18) = 25 m/s. Therefore, the distance between them one second before they collide is 25 meters.

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