Question: Two trains are moving towards each other at speeds of 80 km/h and 120 km/h. If they are 400 km apart, how long will they take to meet?

Options:

1. 2 hours
2. 2.5 hours
3. 3 hours
4. 3.5 hours

Correct Answer: 3 hours

Solution:

Relative speed = 80 km/h + 120 km/h = 200 km/h. Time = Distance / Speed = 400 km / 200 km/h = 2 hours.