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Kate rode her bicycle for 30 minutes at a speed of 16 mph, then walked for 90 minutes at a speed of 4 mph. What was her overall average speed in miles per hour?

 May 10, 2022
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Average speed ==Total distance / total time.

 

16  x  30/60 ==15 miles travelled on bicycle

4  x  90/60 == 6 miles covered by walking

 

15  +  6 ==21 miles - total distance travelled.

30/60  +  90/60 ==2 hours - total time

 

21 / 2 ==10.50 mph - here average speed for the entire trip.

 May 10, 2022

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