If necessary, round your answers to 1 decimal digit.

1 a. Mary travels in an airplane a distance of 3240 km. For one-fourth of the distance, the airplane flies at a speed of 960 km/h, and for the rest of the distance, it flies at a speed of 816 km/h. How long does the trip take?

 
 
 
 
 
 
 
 
 
2 a. Grace travels in an airplane a distance of 2160 miles. For one-third of the distance, the airplane flies at a speed of 660 miles per hour, and for the rest of the distance, it flies at a speed of 500 miles per hour. How long does the trip take?

 
 
 
 
 
 
 
 
 
3 a. David rides his bike for 5.9 hours with a constant speed of 15 km/h and then for another 2 hours 35 minutes with a constant speed of 13 km/h. What is his average speed for the total trip?

 
 
 
 
 
 
 
 
 
Page 2

Answer Key

1 a. The trip takes 3 hours and 49 minutes or 3.8 hours.
2 a. The trip takes 3 hours and 58 minutes or 4 hours.
3 a. His average speed is 14.4 km/h.


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