The usual speed of a man is X. By walking at a speed 4/5th of X, the man reaches his office 10 minutes late. What is the usual time taken to reach the office if he walks with speed X?
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The usual speed of a man is X. By walking at a speed 4/5th of X, the man reaches his office 10 minutes late. What is the usual time taken to reach the office if he walks with speed X?