# A while walking towards a tower at a constant speed,  observed that the angle of elevation of the top of the  tower changed to 600 from 450. How much more than  will he take to reach of the tower?  (a) 5 min  (c) $5\left(\sqrt{3}-1\right)$min  (b) 5$\sqrt{3}$ min  (d) None of these

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