SOLUTION: A man walking acros a train bridge is 0.65 of the way across the bridge when he hears a train coming. The speed of the train (vt)=60mph. The man run at top speed(constant)in either

Question 484131: A man walking acros a train bridge is 0.65 of the way across the bridge when he hears a train coming. The speed of the train (vt)=60mph. The man run at top speed(constant)in either direction and just get off of the bridge before the train runs over him. How fast can the man run?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A man walking across a train bridge is 0.65 of the way across the bridge when he hears a train coming.
The speed of the train (vt)=60mph.
The man run at top speed(constant)in either direction and just gets off of the bridge before the train runs over him.
How fast can the man run?
:
let m = running speed of the man
:
.35 is the dist from the end of the bridge that the train enters
:
From the information given, we know that he will run .35 of the way across the
bridge when the train enters the bridge.
If he runs away from the train, when train enters the bridge he will be:
.65 - .35 = .30 from the opposite side of the bridge from the train.
He has to run the remaining .3 dist while the train travels the whole dist; or 1
A ratio equation:
=
m = .3(60)
m = 18 mph he has to run to just make it.
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