what is the easiest way to answer this question???

Question

Two trains A and B are initially 100 miles apart facing each other on the same train track. Unfortunately the trains are headed toward each other, and each is going at a constant speed of 50 miles per hour. A superfly starts on the front of train A, flies to train B, immediately turns around and flies back to train A, etc. The fly zigzags this way back and forth at a speed of 200 miles per hour until the trains collide. At the last second (fortunately) our fly moves away from the collision. How many miles does the super fly travel until the trains collide? (its OK to neglect the length of the train).

Answer 1

Just note that it takes the trains 1 hour to collide. Since the fly is moving at 200 miles per hours, and was also traveling for 1 hour, you can infer that the fly traveled 200 miles.

Answer 2

I would say that Paritck M's answer seems entirely reasonable to me. It takes one hour for the trains to collide, the fly flies back and forth at 200 mph. So the fly would have traveled a distance of 200 miles. If you are talking about displacement, the fly's position changed by only 50 miles during this time as it is 50 miles away from where it initially started.

Answer 3

200 miles.