Multiple choice

R and S start walking towards each other at 10 a.m. at speed of 3 km/hr and 4 km/hr, respectively. They were initially 17.5 km apart. At what time will they meet?

  1. 2:30 p.m.

  2. 1:30 p.m.

  3. 11:30 a.m.

  4. 12:30 p.m.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Relative speed = 3 + 4 = 7 km/hr. Time to meet = Distance / Relative Speed = 17.5 / 7 = 2.5 hours. 10:00 a.m. + 2.5 hours = 12:30 p.m.

AI explanation

Using the concept of relative speed for two bodies moving towards each other, their effective speed is 3 + 4 = 7 km/hr. The time taken to cover the initial distance of 17.5 km is calculated as 17.5 divided by 7, which equals 2.5 hours. Adding 2 hours and 30 minutes to the start time of 10 a.m. gives the meeting time of 12:30 p.m.

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