Question
If a man walks at 7/8 of his usual speed, he reaches his
office 20 minutes later than the usual time. Find the usual time he takes (in minutes).Solution
New speed: Usual speed = 7:8 So, New time: Usual time = 8:7 Let the New time and Usual time be 8x and 7x respectively. According to the question, 8x-7x = 20 minutes  x = 20 minutes Now, The usual time = 7x = (7 x 20) minutes =140 minutes The required usual time is 140 minutes.
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