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Average Speed

If the speed ...

Question

If the speed of a car is $20 m s^{- 1}$ , what is the speed in $k m h^{- 1}$ ?
72

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Solution

The correct option is A 72
Given:
Speed of a car $= 20 m s^{- 1}$ $= \frac{20 m}{1 s}$

$[1 m = \frac{1}{1000} k m, 1 s = \frac{1}{3600} h]$

$\Rightarrow \frac{20 \times \frac{1}{1000} k m}{1 \times \frac{1}{60 \times 60} h}$

$\Rightarrow \frac{20 \times 3600}{1000} k m h^{- 1}$

$\Rightarrow 72 k m h^{- 1}$

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