exam Maths Puzzle Numerical Ability

a cruise boat travels 24 miles downstream in 3 hours and returns to its starting point upstream in 6 hours. find the speed of the stream.

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exam Other Question

I need to know how to solve the equation using the distributive property.
7(6-y) = -3(y-2) Which of the following is a simplified expression equal to 9-x^2 over x-3 for all x<-3?