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Length

A person goes...

Question

A person goes from point A to point B in 20 seconds and then returns back to point A in 18 seconds. The distance between A and B is 38 m. What is the average speed of the person?

1.75 m/s

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1.5 m/s

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1 m/s

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2 m/s

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Solution

The correct option is D 2 m/s
The average speed of an object can be defined as the total distance travelled by it in a particular interval of time. It can be calculated by dividing the total distance travelled by the total time taken.

Mathematically,
$A v e r a g e s p e e d$ = $\frac{T o t a l d i s t a n c e t r a v e l l e d}{T o t a l t i m e t a k e n}$

$A v e r a g e s p e e d$ = $\frac{38 + 38}{20 + 18}$ = $2 m / s$

Therefore, option D is correct.

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