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Question

The speed of $90 k m / h$ is equal to
$10 m / s e c$
$25 m / s e c$
$n o n e o f t h e s e$
$18 m / s e c$

A

n o n e o f t h e s e

B

10 m / s e c

C

18 m / s e c

D

25 m / s e c

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Solution

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$1 k m / h = \frac{1000}{3600} = \frac{5}{18} m / s$
Speed of $90 k m / h = \frac{90 \times 5}{18} m / s e c$
$= 25 m / s e c$

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