If necessary, round your answers to 1 decimal digit.

1 a. Julia rides her bike for 4.2 hours with a constant speed of 17 km/h and then for another 4 hours 38 minutes with a constant speed of 15 km/h. What is her average speed for the total trip?

 
 
 
 
 
 
 
 
 
2 a. A police car drives for 3 hours with a constant speed of 64 km/h and then for another 1 hour 3 minutes with a constant speed of 79 km/h. What is its average speed for the total trip?

 
 
 
 
 
 
 
 
 
3 a. An airplane flies for 3.1 hours with a constant speed of 760 mph and then for another 33 minutes with a constant speed of 740 mph. What is its average speed for the total trip?

 
 
 
 
 
 
 
 
 
Page 2

Answer Key

1 a. Her average speed is 16 km/h.
2 a. Its average speed is 67.9 km/h.
3 a. Its average speed is 757 mph.


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