Homework Help: pre-calculus

Posted by ruca on Wednesday, March 17, 2010 at 11:05am.

A man who can row in still water at 3 mph heads directly across a river flowing at 7 mph.

At what angle to the line on which he is heading does he drift downstream and at what speed does he drift downstream?

pre-calculus - drwls, Wednesday, March 17, 2010 at 11:22am
He drifts downstream at the river's speed, 7 mph. He has a 3 mph component across the river.

His direction with respect to the heading angle (straight across) is
tan^-1 7/3 = 66.8 degrees (towards downstream)

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