Question 831426: Jon was walking across a bridge one day. He knew that a train was due to come across the bridge soon, but it was a nice day a he wasn't too worried. He was a fourth of the way across the bridge when he heard the sound of a train. Looking back he saw a huge locomotive coming directly at him at 50 mph. Jon figured out that he could get to the far end of the bridge at the same time as the train. He also knew that he could run back toward the train and get to the near end of the bridge at the same time. How fast is Jon running?
(Hint: Jon could be average... but he could also be bionic Jon or slow-mo Jon... Don't be realistic about how fast he is running)
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! He was a fourth of the way across the bridge when he heard the sound of a train.
Looking back he saw a huge locomotive coming directly at him at 50 mph.
Jon figured out that he could get to the far end of the bridge at the same time as the train.
He also knew that he could run back toward the train and get to the near end of the bridge at the same time.
How fast is Jon running?
:
from the information given us, we know that by the time the train reaches the
entrance to the bridge, he could run another fourth of the bridge so he would
be half way across when the train enters the bridge.
:
The train travels the length of the bridge while he travels half the distance,
The train is going 50 mph, therefore he must run 25 mph
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