A field team uses an ultrasound pulse-echo instrument to measure the thickness of a glacier. The instrument assumes that sound travels through the ice at 3600 m/s and displays a thickness of 24.0 m.
A borehole drilled at the same point shows that the ice is actually 25.6 m thick.
What is the actual speed of sound in this ice?
1920 m/s1920\ \mathrm{m/s}1920 m/s
3375 m/s3375\ \mathrm{m/s}3375 m/s
3840 m/s3840\ \mathrm{m/s}3840 m/s
7680 m/s7680\ \mathrm{m/s}7680 m/s