Question: Two trains are moving towards each other at speeds of 80 km/h and 100 km/h. If they are 450 km apart, how long will they take to meet?

Options:

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

Correct Answer: 3 hours

Solution:

Relative speed = 80 km/h + 100 km/h = 180 km/h. Time = Distance / Speed = 450 km / 180 km/h = 2.5 hours.