Multiple choice

The distance between two points A and B is 110 km. A motorcyclist P starts from A towards B at 7 am at a speed of 20 km/hr. Another motorcyclist Q starts from B towards A at 8 am at a speed of 25 km/hr. At what time will they meet each other?

  1. 9 am

  2. 11 am

  3. 10 am

  4. 12 am
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

P travels for 1 hour alone (20 km). Remaining distance is 90 km. Relative speed is 20 + 25 = 45 km/hr. Time to meet = 90 / 45 = 2 hours after 8 am, which is 10 am.

AI explanation

By 8 am, motorcyclist P travels for 1 hour at 20 km/hr, covering 20 km and leaving a remaining distance of 90 km. From 8 am onwards, their relative speed is 20 km/hr plus 25 km/hr, which equals 45 km/hr. The time taken to meet after 8 am is 90 km divided by 45 km/hr, resulting in 2 hours, so they meet at 10 am.

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