Question

Spot, a well trained dog, hears the dinner bell and starts trotting home at a speed of 1 meter per second. He arrives home in exactly 15 minutes. How long, in seconds, did it take the sound of the bell to reach Spot. Use 1235 km per hour for the speed of sound. 1 mile = 1.609 km

Answer 1

distance,

s = vt , where v = 1m/s, t = 15 min = 900 s

so, s = 900 m

Now, speed of sound is 1235 km/h = 343 m/s

so, t = s/v_s

or, t = (900 m)/(343 m/s)

or, t = 2.62 s

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