Multiple choice

A and B are at a distance of 150 km from each other. A started travelling towards B on his bicycle at a speed of 30 kmph. One hour later, B also started travelling towards A on his bicycle at a speed of 20 kmph. How much distance does B cover before they meet?

  1. 33 km

  2. 36 km

  3. 48 km

  4. 56 km

  5. 72 km
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the first hour, A travels 30 km, reducing the distance between them to 120 km. Once B starts, they travel toward each other with a combined relative speed of 50 kmph (30 + 20). It takes them 120 / 50 = 2.4 hours to meet, during which B covers a distance of 20 kmph * 2.4 hours = 48 km.

AI explanation

In the first hour, A travels 30 km, reducing the remaining distance between them to 120 km. When B starts, they travel towards each other, so their relative speed is 30 kmph plus 20 kmph, totaling 50 kmph. They meet after 120 km divided by 50 kmph, which is 2.4 hours; multiplying this by B's speed of 20 kmph gives the distance B covers as 48 km.

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