# AP Physics

Two locomotives approach each other on parallel tracks. Each has a speed of v = 85 km/h with respect to the ground. If they are initially d = 7.0 km apart, how long will it be before they reach each other?

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1. Since both vehicles are travelling at the same speed, they will meet at the midpoint.

d = V*t = 7km/2 = 3.5 km.

t = d/V = 3.5/85 = 0.04117647 h = 2.47 min.

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posted by Henry

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