Multiple choice

Trains A and B are 220 km apart as they start moving towards each other with speeds of 60 kmph and 50 kmph, respectively. After 1 hour, if train A decreases its speed to 50 kmph, then how much more time will it take for the trains to meet?

  1. 44 minutes

  2. 66 minutes

  3. 56 minutes

  4. 70 minutes

  5. 72 minutes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the first hour, the trains cover (60 + 50) * 1 = 110 km. Remaining distance is 220 - 110 = 110 km. With both speeds now 50 kmph, the relative speed is 50 + 50 = 100 kmph. Time = 110 / 100 = 1.1 hours, which is 66 minutes.

AI explanation

In the first hour, train A covers 60 km and train B covers 50 km, reducing the total distance between them by 110 km. This leaves a remaining distance of 110 km between the two trains. After train A decreases its speed to 50 kmph, their new relative speed moving towards each other is 50 kmph plus 50 kmph, totaling 100 kmph. The additional time needed to meet is the remaining distance of 110 km divided by the relative speed of 100 kmph, which equals 1.1 hours, or 66 minutes.

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