The sum of the speeds of two trains is 719.5 mph. If the speed of the first train is 4.5 mph faster than the first, find the speeds of each

Taking 4.5 mph away from 719.5 mph, and divinding by 2, you get the speed of the slower train.

(719.5-4.5)/2 = 357.5 mph

The speed of the faster train is 357.5+4.5 = 362 mph.