a plane flies at a speed of 400mph how long will it take her is the map scale is 1in=300mi

Question

400 mph map scale is 300mi equals 1in

Answer 1

This question is not worded clearly.  The map scale has nothing to do with the flight time.  I assume you are asking how long it takes to fly 300 miles at a speed of of 400 mph.

 

time = distance/speed = (300 miles)/(400 miles/hour) = 0.75 hours