Jane travel a distance of 60 miles @ 30 mph and another 90 miles @ 60 mph. What is her average speed for the entire journey (in mph)?
A) 40
B) 42.8
C) 45
D) 52.3
E) 54.7
A) 40
B) 42.8
C) 45
D) 52.3
E) 54.7
Total distance = 150 miles
distance=60 miles speed=30mph
time =60/30=2
distance=90 miles speed =60mph
time=90/60=1.5
AS=Total distance/Total time=150/(2+1.5)=150/3.5
42.8
Option B
