Math Forum - Problem of the Week

Train Trouble

Herman and Sheila were on one of their Saturday adventures, this time walking along a railroad track. They came to a tunnel and decided to walk through, even though they knew they shouldn’t.

After they had walked 2/5 of the way through the tunnel, they heard a train whistle blow in the distance, but couldn’t tell from which direction the train was approaching. In their fright they began running in opposite directions. They both ran at a constant speed of 15 miles an hour. Each child barely got out of the tunnel in the nick of time. How fast was the train moving?

Click here to see Herman and Sheila run. Read the instructions at the top of the page while the applet is loading.

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