exam Maths Puzzle Numerical Ability

A plane can travel 400 miles against the wind in the same time that it can travel 500 miles with the wind. If the speed of wind was 10 miles per hour. Find the speed of the plane in still air.

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exam Other Question

Use trigonometric ratios and/or the Pythgorean Theorem to find the lengths of sides b and c. Round your anser to the nearest tenth. I need help with solving w=Cr with the square root of -2
1 mile=5,280
In particular, the weight of an object follows this equation : w=Cr^-2, where C is a constant, and r is the