Homework Help: Trig

Posted by Adam on Sunday, November 18, 2012 at 5:12am.

Suppose you would like to cross a 209-foot wide river in a boat. Assume that the boat can travel 32 mph relative to the water and that the current is flowing west at the rate of 6 mph. If the bearing chosen is chosen so that the boat will land at a point exactly across from its starting loin, how long will it take for the boat to make the crossing? Give your answer to the nearest second.

Trig - Steve, Sunday, November 18, 2012 at 3:24pm
if the boat travels s seconds,
1 km/hr = 1.4667 ft/s

209^2 + (6*1.4667s)^2 = (32*1.4667s)^2
s = 4.5 sec

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