exam Maths Puzzle Numerical Ability

a boat travels 50km downstream in the same time that it takes to go 30km upstream. The speed of the boat in still water is 16 km/h. Find the speed upstream.

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exam Other Question

(7X 3 - 2X 2 + 4X - 1) - (9X 3 - 4X 2 + X - 3) + (2X 3 - 2X 2 - 3X -2).

Please show me how to solve. Thanks! Two jets leave leave Denver at 9 a.m. one flying east at a speed 50 kmph greater than the other, which is traveling west. At 11 a.m. the planes are 2500 km. apart. Find their speed