Multiple choice

Distance between two points A and B is 110 km A motor cycle rider starts from A towards B at 7 am at a speed of 20 km/hr. Another motor cycle rider starts from B towards A at 8 am at a speed of 25 km/hr. Find when will they cross each other.

  1. 11 am

  2. 9 : 30 am

  3. 8 : 30 am

  4. 10 am
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

At 8 am, the first rider has traveled 20 km. Remaining distance = 110 - 20 = 90 km. Relative speed = 20 + 25 = 45 km/hr. Time to meet = 90 / 45 = 2 hours after 8 am, which is 10 am.

AI explanation

By 8 am, the first rider has travelled for 1 hour at 20 km/hr, reducing the remaining distance to 90 km. Their relative speed moving towards each other is 20 plus 25, which equals 45 km/hr. The time taken to meet after 8 am is 90 divided by 45, which is 2 hours, making the crossing time 10 am.

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