Answer:
252 miles.
Step-by-step explanation:
Take one of the first set of trains
By 5 o'clock it has travelled 1 hour, so it goes 37 miles.
Therefore the first 3 trains travel for 3*37 = 111 miles.
The other 3 travel for 3 * 47 miles during that hour.
= 3*47 = 141 miles.
Total for 6 trains = 111+ 141
= 252 miles.