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By walking at 3/4 of his usual speed, a man reaches his office 20 minutes later than usual. His usual time is :

By walking at 3/4 of his usual speed, a man reaches his office 20 minutes later than usual. His usual time is : Correct Answer 60 minutes

প্রতিবার সে একই distance অতিক্রম করে, ধরি, usual speed = 1 একক এবং, usual সময় = x min দূরুত্ব = বেগ×সময় d = 3/4 (x + 20) = 1× x 3x + 60 = 4x x = 60

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