THE AVERAGE SPEED IS SET TO CONFUSE YOU.
Step-by-step explanation:
IF YOU SEE, THE AVERAGE SPEED YOU TAKE OUT WITH THE SPEEDS
INITIAL AND FINAL YOU ALREADY HAVE
v s (45 mi/h + 70 mi/h)/2 x 57.5 mi/h
ALMOST IS EQUAL TO 60 mi/h
AS FOR TOTAL TIME DISTANCE IS REQUIRED, WE KNOW THAT MARY
TRAVELS FOR MORE THAN TWO HOURS, BUT WE DON'T KNOW FROM
HOW FAR FROM THE AIRPORT MARY START DRIVING. IT WON'T
TAKE THE SAME IF MARY DRIVES FROM MONTGOMERYI OR FROM
BUENOS AIRES, ARGENTINA.
