Speed of sound in air is about 330 m/sec, express the speed in kilometre per hour, how long will the sound take to travel 99 kilometre.

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Solution

$(1) . speed of sound = 330 m / s = \frac{\frac{330}{1000}}{\frac{1}{3600}} = \frac{330}{1000} \times \frac{3600}{1} = 1188 km / h (2) . time taken to cover 99 km = \frac{distance}{speed} = \frac{99}{1188} = \frac{1}{12} hr = \frac{1}{12} \times 60 \min = 5 \min$

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Speed of sound in air is about 330 m/sec, express the speed in kilometre per hour, how long will the sound take to travel 99 kilometre.

1.speed of sound = 330 m/s = 330100013600=3301000×36001= 1188 km/h2.time taken to cover 99 km = distancespeed = 991188= 112hr = 112×60 min = 5 min

$(1) . speed of sound = 330 m / s = \frac{\frac{330}{1000}}{\frac{1}{3600}} = \frac{330}{1000} \times \frac{3600}{1} = 1188 km / h (2) . time taken to cover 99 km = \frac{distance}{speed} = \frac{99}{1188} = \frac{1}{12} hr = \frac{1}{12} \times 60 \min = 5 \min$