Math question plz help!!?

Question

Washington, DC is on eastern standard time, Minneapolis is on central standard time (1 hr earlier than eastern standard time), and Las Vegas is on Pacific standard time (3 hrs earlier than eastern standard time). A flight leaves Washington, DC at 8:30 A.M. eastern standard time, stops for 1 hour and 15 minutes in Minneapolis, then arrives in Las Vegas at 2:20 P.M. Pacific time. How long is the plane actually flying?

Answer 1

The time in Washington when the plane landed in La's Vegas at 2.20 PM  is 5.20 PM. That means the plane took 8hrs and 50 minutes to complete the journey. Out of this it halted for 1hr. 15min in Minneapolis. Hence the plane spent 7hours and 35 minutes in flying.

Answer 2

7:35

Answer 3

Arriving at 2:20 pm Pacific time?  That's a long flight.

5:30am to 2:20pm = 9:50 - 1:15 = 8 hr 35 m.