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Two motorcycles, travelling at the same speed, approach an intersection, one from the north and the...

Two motorcycles, travelling at the same speed, approach an intersection, one from the north and the other from the west. When one motorcycle is 110m north and the other is 80m west of the intersection, the distance between them is decreasing at 30m/s. Determine the speed of the motorcycles. [ANSWER: 21.5m/s ]

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