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Alex and Bob both walk to work, and leave their house at the same time. If Alex is walking east at 5 feet/sec and Bob

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Alex and Bob both walk to work, and leave their house at the same time. If Alex is walking east at 5 feet/sec and Bob is walking south at 12 feet/sec, at what rate is the distance between them changing after 30 seconds? " 15 feet/sec 17 feet/sec 13 feet/sec 20 feet/sec

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