Question 181654
Concept:  speed=distance/time

We know that train 2 was going at a speed of 45km/hour and traveled 4 hours to catch up with train 1...so
 45=d/4
45(4)=(d/4)(4)
180=d

so the distance that train2 traveled in 4 hours was 180km...

Now train1 traveled this same distance in how long?  well we know it got a head start of 14hrs. and then the 4hrs. train2 had to travel ....

train1 traveled 180km in 18hrs.

so 
speed=180km/18hrs.
speed=10km/hr