Patrol Boat

Patrol Boat
Hudson River is flowing at a rate of 3 miles per hour. Patrol boats, Travel 60 miles upriver, and returns?

Of the Hudson River three miles per hour Speed flows. Patrol boat, 60 miles upstream of the travel and 9 hours of total time to return. What speed in mph near the boat What is still in the water?

[1 time / (X-rays, 3) m] * 60 miles = time upstream [1 hours / (x +3) m] * 60 miles = time stream Time + time = 9 times so downstream from the upstream coupled equations: 1 / (X 3) + 1 / (x +3) = 9 / 60 (x +3 + X and - 3) / [(x +3) (x-ray) 3] = 9 / 60 2x = 9 / 60 * (x ^ 2-9) 0 = (9 / 60) x ^ 2 - 2 times - (60 분의 81) 0 = x ^ 2 - (120 / 9) x - 9 = x ^ 2 - 40-speed, 3-9 for the second resolution X Using the formula. close to x = 14 mph. (The other root, is negative A boat that does not retreat.)

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