20. Al and Bob are at opposite ends of a diameter of a silo in the shape of a tall right cireular cylinder with radius 150 ft. Al is due west of Bob. Al begins walking along the edge of the silo at 6 ft per second at the same moment that Bob begins to walk due east at the same speed. The value closest to the time in seconds when Al first can see Bob is: A. 46 В. 47 С. 48 D. 49 E. 50

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