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[video type=youtube]A5vZBUYBKH4[/video]

For the daily quiz, my brain is screaming two things

"less than 10 miles an hour",

and,

"thats what he's expecting you to say!"


choices, choices!

Joe :huh:

Ok I think I have got this. Well if the genius can run to the beginning, 3/8 of the bridge, in the time it takes the train to reach the bridge Then that means the guy can run 3/8th of the bridge in the opposite direction by the time the train reaches the bridge which totals 6/8ths or 3/4 of the bridge. This then means that the train could travel the whole bridge in the same time as it took the genius to travel 1/4 of the bridge. This then means the train is moving 4 times the speed that the genius is going which I believe would be 40MPH

The train is going 40 miles an hour.

Dieguy, Same way I figured it out.

I would go the shorter distance. Less chance to fall or get stuck.

Yes Andy I agree with your logic but then you would have to be running full out straight at a train heading straight for you. I think I would run faster being chased by a train than running directly at one. I bet I could hit 11 or 12 MPH if I was being chased by a train :laugh:

Bill

Well I don't get guydie's logic and how he got to 6/8ths. But, using simultaneous equations that allow you to cancel the unknowns of 'the distance from the train's starting point to the bridge' and the 'length of the bridge', I also got to 40 miles per hour.

SO either it's a coincidence and we're all wrong. Or I guess it's 40 miles per hour since we've come up with the same speed using logic and math.

40 mph train speed

What kind of genius would walk along a train track with no room ?? :huh:

good point!