book Maths Puzzle Numerical Ability

Rita rows 12 km upstream and 12 km downstream in 3 hours. The speed of her boat in still water is 9 km/hr. Find the speed of the stream.

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Subject: Financial Management
Problem #1

An investor recently purchased a corporate bond which yields 9 percent. The investor is in the 36 percent combined federal and state ta When i worked this problem, the graph did not turn out right. The equation is xsquared-5x+6=0. I have to solve the equation by graphing. could you please help me out?