Hello, zenith20!

Two trains start at the same time, one from B to M and the other from M to B.

If they arrive at their destinations 1 hour and 4 hours resp. after passing each other,

how much faster is one train running than the other?

Train #1 starts at and moves east at mph.

In hours, it has moved miles.

Code:

P
B *-------------o---------* M
: - - bt - → : - - - → :
P
B *-------------o---------* M
: ← - - - - - : ← mt - :

Train #2 starts at and moves west at mph.

In hours, it has moved miles.

They pass each other at point

Train #1, at mph, takes 1 hour to travel the distance

. . We have: . .[1]

Train #2, at mph, takes 4 hours to travel the distance

. . We have: . .[2]

Equate [1] and [2]: .

Therefore: . . . . Train #1 is twice as fast as Train #2.