Answer:
Distance between both Station X is 900 miles
Explanation:
The stations are directly across from each other and X miles away.
X is the sum of the distance travel by train A + distance travel by train B
Train A
leaves station A at 1 P.m. meet Train B at 4 P.m= 3 hours
distance travel by train A= time x velocity
distance travel by train A=3 hours x 200 mph
distance travel by train A= 600 miles
Train B
Leaves station b at 3 P.m. meet Train A at 4 P.m= 1 hours
distance travel by train B= time x velocity
distance travel by train B=1 hours x 300 mph
distance travel by train B= 300 miles
Distance between both Station 600 miles+300 miles=900 miles