The velocity of sound in air is $332 m / s$ . If the unit of length is km and unit of time is hour, then the value of velocity is :

1146 k m / h

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1195 k m / h

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1086 k m / h

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1218 m / h

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Solution

The correct option is B $1195 k m / h$
We know that $1 m = 10^{- 3} k m$
Also, $1 s = \frac{1}{3600} h r$

$Velocity = 332 \frac{m}{s} = 332 \times \frac{10^{- 3} k m}{(\frac{1}{3600}) h r} \approx 1195 k m / h r$

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