Two microphones are 1.02 m apart along the direction of a sound pulse. The pulse reaches the second microphone 3.0 ms after the first. What is the measured speed of sound?
306 m/s306\ \mathrm{m/s}306 m/s
680 m/s680\ \mathrm{m/s}680 m/s
170 m/s170\ \mathrm{m/s}170 m/s
340 m/s340\ \mathrm{m/s}340 m/s