If necessary, round your answers to 1 decimal digit.

1 a.

An airplane flies for 4.3 hours with a constant speed of 1000 km/h and then for another 3 hours with a constant speed of 920 km/h. What is its average speed for the total trip?

2 a.

An airplane flies 1496 km with a constant speed of 680 km/h and another 1983.3 km with a constant speed of 1000 km/h. What is its average speed for the total trip?

3 a.

David travels in an airplane a distance of 3480 miles. For one-fourth of the distance, the airplane flies at a speed of 720 miles per hour, and for the rest of the distance, it flies at a speed of 820 miles per hour. How long does the trip take?

Page 2

Answer Key

1 a.

Its average speed is 967.1 km/h.

2 a.

Its average speed is 831.7 km/h.

3 a.

The trip takes 4 hours and 23 minutes or 4.4 hours.

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