If I am correct the range is just the space in between the high and the low so you just at add the two together 56+4=60 degree Fahrenheit
The answer is 39446 i hope this helps
Subtract the faster speed:
721.6 - 8.4 = 713.2
Divide by 2 trains:
713.2/2 = 356.6
The slower train is going 356.6 miles per hour.
The faster train is going 356.6 + 8.4 = 365 miles per hour.
This equation would be written as 2(n-3)=8.