average speed

Algebra Level 1

I walked 400 400 meters from my house to the gym in 80 80 seconds, then from the gym back to my house in 100 100 seconds. What is my average speed the whole trip in meters per seconds rounded to two decimal places?


The answer is 4.44.

A Former Brilliant Member by A Former Brilliant Member

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3 solutions

Mohammad Khaza
Jul 12, 2017

average speed = total distance /total time

or, average speed = 800 180 \frac {800}{180} =4.44 m/s

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a v e s p e e d = t o t a l d i s t a n c e t o t a l t i m e = 800 180 = 4.44 m s ave~speed=\dfrac{total~distance}{total~time}=\dfrac{800}{180}=4.44\dfrac{m}{s}

1 Helpful 0 Interesting 0 Brilliant 0 Confused

average speed = total distance total time = 400 + 400 100 + 80 ≈ 4.44 \text{average speed}=\dfrac{\text{total distance}}{\text{total time}}=\dfrac{400+400}{100+80}\approx 4.44 meter per second

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