2 trains are headed towards each other with 12kmh N 8kmh. A bird starts flying from one to another when they are 20km apart with a velocity of 15kmh. What will be the distance travelled by the bird when they crash?
The trains are approaching each other at a combined velocity of 12 + 8 = 20 km/h
They are 20 km apart.
Thus, they will take 1 hour to collide.
The bird is flying at a velocity of 15 km/h.
In 1 hour the bird will fly 15 km.
Thus, the bird will have traveled 15 km when the trains crash.
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