If necessary, round your answers to 1 decimal digit.

1 a. An airplane flies for 0.4 hours with a constant speed of 880 km/h and then for another 4 hours 45 minutes with a constant speed of 640 km/h. What is its average speed for the total trip?

 
 
 
 
 
 
 
 
 
2 a. David's airplane trip took 2 hours. For one-fourth of that time, the airplane flew at a speed of 680 km/h, and for the rest of the time, it flew at a speed of 1000 km/h. What distance did David travel?

 
 
 
 
 
 
 
 
 
3 a. Nancy travels in an airplane a distance of 3420 miles. For one-half of the distance, the airplane flies at a speed of 760 miles per hour, and for the rest of the distance, it flies at a speed of 520 miles per hour. How long does the trip take?

 
 
 
 
 
 
 
 
 
Page 2

Answer Key

1 a. Its average speed is 658.6 km/h.
2 a. David traveled 1840 km.
3 a. The trip takes 5 hours and 32 minutes or 5.5 hours.


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