Henry Ernest Dudeney/Modern Puzzles/39 - The Two Trains

by : $39$

 * The Two Trains
 * Two railway trains, one $400$ feet long and the other $200$ feet long, ran on parallel rails.
 * It was found that when they went in opposite directions they passed each other in $5$ seconds,
 * but when they ran in the same direction the faster train would pass the other in $15$ seconds.


 * Now, a curious passenger worked out from these facts the rate per hour at which each train ran.
 * Can the reader discover the correct answer?


 * ''Of course, each train ran with a uniform velocity.