Frustrated with Physics: Measuring Temperature Changes in the Ocean

[lostie100]

Ok. At a depth of 1000m, the ocean temp is 4 degrees celsius and the speed of sound is 1480m/s. From lab experiments, for every 4m/s increase in velocity, the temp increases by 1 degrees.
When the distance is 8000km, the smallest time change that can be detected is 1s, what is the smallest temp change that can be measured?

I am so frustrated w/ this question.

 

[LowlyPion]

Ok. At a depth of 1000m, the ocean temp is 4 degrees celsius and the speed of sound is 1480m/s. From lab experiments, for every 4m/s increase in velocity, the temp increases by 1 degrees.
When the distance is 8000km, the smallest time change that can be detected is 1s, what is the smallest temp change that can be measured?

I am so frustrated w/ this question.

Start with the smallest speed change you can effectively measure. If you can't resolve a sound wave that travels 8 x 10^6 m and know within 1 second when it started then you can't measure any finer scale of speed than that can you? So what would that be in terms of the smallest "increment" of speed that you can represent?

Knowing that can't you figure the smallest temp change that you can reliably record if you are basing your measurement on the measured speed?