A sonar system calculates depth using a sound speed of 1500 m/s. It displays a depth of 90 m. The actual sound speed is 1440 m/s.
What is the actual depth below the transmitter?
86.4 m86.4\ \mathrm{m}86.4 m
93.8 m93.8\ \mathrm{m}93.8 m
172.8 m172.8\ \mathrm{m}172.8 m
187.5 m187.5\ \mathrm{m}187.5 m