Two trains are 40 kilometers (km) apart when they begin to travel towards each other

Two trains are 40 kilometers (km) apart when they begin to travel towards each other (on
straight, adjacent, parallel tracks) and each is travelling at 20 km/hr. A bird flies from one to the other at a constant speed of 40 km/hr, beginning at the same time. What distance will the bird have traveled when it reaches the other train? If the bird then instantaneously reverses direction and flies back to the first train at the same speed, and then again instantaneously reverses direction and continues in this way to fly back-and-forth between the trains, what is the total path length it will have flown by the time the trains pass each other? (Hint: There is a hard approach and a simple approach). What is the bird’s average velocity over this time?

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