Multiple choice

A bus moving with a speed of $10m/s$ on a straight road. A scooterist wishes to overtake the bus in $100s$. If the bus is at a distance of $1km$ from the scooterist, with what speed should the scooterist chase the bus?

  1. $10m/s$
  2. $20 m/s$
  3. $40 m/s$
  4. $25 m/s$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Relative speed = Distance / Time. The distance is 1000m and time is 100s, so relative speed = 10m/s. Since the bus is moving at 10m/s, the scooterist must travel at 10m/s + 10m/s = 20m/s.

AI explanation

The relative distance the scooterist must cover to catch the bus is the initial 1 km gap, which equals 1000 meters. Using the relative speed formula, the required relative speed is distance divided by time, giving 1000 divided by 100 to equal 10 m/s. Since relative speed is the scooterist's speed minus the bus's speed, the scooterist's speed must be 10 plus 10 to equal 20 m/s.

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