A school of tuna is making a 200 mile trip at an average air speed of 3 miles per hour in still water, but is swimming againist a current.
Express the tuna's travel time t, as a function of the current speed, v.
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So, their actual speed is the "air speed" minus the current:
s = 3-v
And the time it will take them to make the trip is the distance divided by their speed:
t = 200/s
and write and solve an equation to find the current spees if the school make its trip in 8 hours.
For that, just take the final equation and solve it for v:
t = 200/(3-v)
3 - v = 200/t
v = 3 - 200/t
and plug in 8 for t:
v = 3 - 200/8 = -22
(the negative number just means that the current is working in their favor)