Question 1095472: Ming's boat goes 20 mph in still water. It travels 75 miles upstream and back in a total time of 8 hours. what is the speed of the current?
+ = 8.
Solve for c, the speed of the current.
To solve it, multiply both sides by (20-c)*(20+c) = 400-c^2.
Then solve the obtained quadratic equation for c to get the
Answer. c = 5 miles per hour.
You can put this solution on YOUR website! Ming's boat goes 20 mph in still water. It travels 75 miles upstream and back in a total time of 8 hours. what is the speed of the current?
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c = current
75/(20-c) + 75/(20+c) = 8
75*(20-c) + 75*(c+20) = 8(400 - c^2) = 3200 - 8c^2
3000 = 3200 - 8c^2
8c^2 = 200
c^2 = 25
c = 5 mi/hr
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If you mean it's 75 miles round-trip, do it the same way.
