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Truck convoy A is approaching a depot from the east at 60 mi/hr while convoy B...

Truck convoy A is approaching a depot from the east at 60 mi/hr while convoy B is moving north away from the depot at 50 mi/h. How fast is the distance between the convoys changing when A is 4 mi from the depot and B is 3 mi from the depot?

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Answer: 18 miles per hour

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