If the speed of a car is 20 m s − 1 , what is the speed in k m h − 1 ? Options: A . &nbsp36 B . &nbsp72 C . &nbsp108 D . &nbsp90

Answer: Option B : B Given that the speed of a car = 20 m s − 1 = 20 m 1 s [ 1 m = 1 1000 k m , 1 s = 1 3600 h ] = 20 × 1 1000 k m 1 × 1 60 × 60 h = 20 × 3600 1000 k m h − 1 = 72 k m h − 1 .

If the speed of a car is 20 ms−1, what is the speed in km h

Question

If the speed of a car is

20 m s^{- 1}

, what is the speed in

k m h^{- 1}

Options:

A . 36

B . 72

C . 108

D . 90

Answer: Option B
:
B
Given that the 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

]

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

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

= 72 k m h^{- 1}

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