Answer:
1687.5 miles
Step-by-step explanation:
Given: A jet plane traveling at 450 mph overtakes a propeller plane traveling at 250 mph that had a 3-hour head start.
To Find: How far from the starting point are the planes
Solution:
Speed of jet plane =

speed of Propeller plane =

Distance travelled by propeller plane in 3 hours head start = 
=
=

Distance to be travelled by jet plane to overtake propeller plane = 

Relative speed of both planes = 

Time taken by jet plane to overtake propeller plane =


total distance travelled by plane = 

planes are
far from starting point.