Question 955927
E=speed of Eastbound train; E+20mph=speed of Westbound train 
760 miles/4hours=190mph The combined speed of the trains is 190 mph.
E+E+20mph=190mph
2E=170mph
E=85 mph ANSWER: The Eastbound train is traveling 85 mph.
CHECK:
(4hrs)(85mph)+(4hrs)(105mph)=760 miles
340 miles+420 miles=760 miles
760 miles=760 miles