Question

Train A departs from Point A with a velocity of 150 km/h, Train B departs from Point B with a velocity of 100 km/h, and the distance between point A and B is 500 km. How long will it take for the trains to meet?

Answer 1

2 hours.

Explanation:

Their combined speed is 100+ 150 = 250 km/h

Speed = distance / time

250 = 500 / t

t = 500/250

= 2 hours.

Answer 2

10 hours or 2 hours

Explanation:

Condition 1 - Both the trains are moving the a same direction.

1. Time = distance÷(speed of A - speed of B)
2. Time = 500÷(150-100) = 10 hrs
3. It will take 10 hrs for them to meet and they will meet exactly at 150×10 = 1500 km from Point A

Condition 2 - Both the trains are moving in opposite directions.

1. Time = distance÷ (speed of A + speed of B)
2. Time = 500÷(150+100) = 2 hrs
3. It will take 2 hrs for them to meet and they will meet exactly at 150×2 = 300 km from Point B