Three students, A, B and C, are measuring how fast sound travels through air.
(a)[2]
Calculate the mean value of $t$. Give your answer to $2$ significant figures.
(b(i))[1]
Suggest a device that could be used to measure the distance.
(b(ii))[1]
Calculate a value for $v$, the speed of sound in air. Use the equation $v = \frac{d}{t}$.
(c)[1]
Suggest one reason why the value worked out in (b)(ii) for the speed of sound in air is only an approximate value.
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