A car is fitted with a device which transmits sound 60 times per minute. There is no wind \( \ma...

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A car is fitted with a device which transmits sound 60 times per minute. There is no wind
\( \mathrm{P} \) and speed of sound in still air is \( 345 \mathrm{~m} / \mathrm{s} \). If

W you hear the sound 68 times per minute when you are moving towards the car with a speed of \( 12 \mathrm{~m} / \mathrm{s} \), the speed of the car must be nearly
(1) \( 20.0 \mathrm{~m} / \mathrm{s} \) towards you
(2) \( 30.0 \mathrm{~m} / \mathrm{s} \) towards you
(3) \( 10.0 \mathrm{~m} / \mathrm{s} \) away from you
(4) \( 10.0 \mathrm{~m} / \mathrm{s} \) towards you
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