exam Maths Puzzle Numerical Ability

A jetliner covered a horizontal distance of 5 mi while following a flight path with slope 0.25. How much altitude did it gain?

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exam Other Question

A bullet if fired horizontally at a target, and the sound of its impact is heard 1.5 seconds later. If the speed of the bullet is 3300ft/sec and the speed of sound is 1100ft/sec, how far away is the target? Solve for x. 3x - 2y = 6
I came up with 2/3y+6. Did I get it?