AlexisLee
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Jamal blasts an air-horn to start a race. Lewis hears the horn from his house 274 meters away. Given that sound travels through air at 340 m/s, how long did it take the sound to travel from Jamal to Lewis?


440 s

0.81 s

1.2 s

66 s

Verified Answer :

AL2006



                   (274 meters)  x  (1 sec / 340 meters)

               =    (274 / 340)  sec

               =       0.806 second   (rounded) 

Answer : Time taken by sound to travel from Jamal to Lewis is 0.81 s.

Explanation :

Given that,

Lewis hears the horn from his house 274 meters away.

The speed of the sound is \(v_s=340\ m/s\)

We have to find the time taken by the sound to travel from Jamal to Lewis. For this we will use the definition of speed which is given by :

\(v_s=\dfrac{d}{t}\)

or

\(t=\dfrac{d}{v_s}\)

\(t=\dfrac{274\ m}{340\ m/s}\)

\(t=0.805\ s\)

or

\(t=0.81\ s\)

So, the correct option is (b).

Hence, this is the required solution.

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