An airplane flies 750 miles due west in 1 1/2 hours and 750 miles due south in 2 hours. What is the average speed of the airplane?

Answer 1

the answer is distance over time.
total distance is 1500 miles total time is 3.5 hours.
1500/3.5=428.57 mph.

Answer 2

1500/3.5 = x/1

3.5x = 1500
x = 428.57 mph

Answer 3

Mr. Anders and Mrs. Rich each drove home from a business meeting. Mr. Anders traveled east at 100 kilometers per hour and Mrs. Rich traveled west at 80 kilometers per hours. In How many hours were they 100 kilometers apart