Since radio-waves travel at a velocity of 300,000 km/sec, the receiving sets receive the signals almost instantaneously and we may consider that the signals from the transmitter at A reach B and C at the same moment, although they are located at different distances from A. But the sound travels from C to B with the velocity of sound (330 m/sec). Therefore the distance from B to C will be the distance travelled by sound in 1 sec, i.e, BC = 330 × 1 = 330 m.
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