Math question

thetrainwillnottakeoff

re the bonus question, depends on conditions. Take it you mean 5km 'track'?

The train is moving at 24 mph, and is half the length of the tunnel away from the entrance when the engineer begins running.

The engineer could run a 15:30 5k. I know I could run faster if a train was about to run me over.

I would think you would have to know how far the train is from the entrance of the tunnel.

I personally believe that U.S. Americans are unable to do so because, uh, some, uh, people out there in our nation don't have maps and, uh, I believe that our, uh, education like such as, uh, South Africa and, uh, the Iraq, everywhere like such as, and, I believe that they should, uh, our education over here in the U.S. should help the U.S., uh, or, uh, should help South Africa and should help the Iraq and the Asian countries, so we will be able to build up our future, for our children.

24mph

set it up,

let v = train's velocity

d = distance from train to tunnel

x=length of tunnel

t(1)=d/v

and t(1)=(.25x)/12

t(2)=(d+x)/v

and t(2)=(.75x)/12

solve for v, get v=24mph

then d and x are any points that satisfy

x=2d

we'll looks like he's gonna get run over by the train then don't it. Unless there are safety niches in which case he should just run to the nearest.I mean if you're still at the

entrance or exit when the train is there you get flattened don't you.He need to improve on his running speed if he wants to get to either and get clear before the train.

For the 5k, purely academic if he gets flattened by the train.

Where the distance does matter is in the assumption that the running speed is constant whether the distance is d or 2d.

sure but it sounded to me like he said the guy could run 12mphmaybe it was d=1 yard or somethingwe would need some kind of decay factor in there or something to solve otherwise

26mi235 wrote:

Where the distance does matter is in the assumption that the running speed is constant whether the distance is d or 2d.

"Rarely is the questioned asked: Is our children learning?" —Florence, S.C., Jan. 11, 2000

Miss Teen South Carolina wrote:

I personally believe that U.S. Americans are unable to do so because, uh, some, uh, people out there in our nation don't have maps and, uh, I believe that our, uh, education like such as, uh, South Africa and, uh, the Iraq, everywhere like such as, and, I believe that they should, uh, our education over here in the U.S. should help the U.S., uh, or, uh, should help South Africa and should help the Iraq and the Asian countries, so we will be able to build up our future, for our children.

The answer is. of course, Steve Profontaine.