Question
Walking 3/4 of his normal speed, Ravi was 21 minutes
late in reaching his office. The usual time took to cover the distance between his home and office was:Solution
3/4 of speed = 4/3 of original time 4/3 of original time = original time + 21 minutes; 1/3rd of original time = 21 minutes; Thus, original time = 21 x 3 = 63 minutes or 1 hour 3 minutes
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