exam Maths Puzzle Numerical Ability

A boat travels 30 miles upstream in 4 hours. The trip downstream takes 2.5 hours. Find the rate of the boat in still water.

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exam Other Question

A roof rises 2.75 ft over a horizontal distance of 15.01 ft. What is the slope of the roof to the nearest hundredth?

Thank you. 2.5% equals what decimal number, & fraction?