You take a trip traveling first by taxi then by plane then b

You take a trip traveling first by taxi, then by plane, then by bicycle, and finally by walking the remaining distance to your destination. The 75-mile taxi ride from your home to the airport takes 90 minutes. The 7500-mile plane trip takes 15 hours. The 500-mile bicycle trip takes 48 hours. The 5-mile walk takes 150 minutes. Your average speed for the entire trip is approximately:
A. 11.2 mph B. 50.0 mph C. 120.6 mph D. 125.2 mph E. 500.0 mph

Solution

add up all the small trips by distance and time
75+7500+500+5=distance=d= 8080 miles
1.5+15+48+150/60=time=t= 67 hours
d=r*t
rate(speed) =d/t=120 40/67=120.6 mph
c. 120.6 mph