Walking at 8/9 th of his usual speed, a man reached his destination 20 minutes later than the time he usually takes to reach his destination. Find the usual time taken by him to reach his destination.
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Ratio of Speed 9 : 8 and Time 8 : 9
1 = 20
7 = 8 X 20 = 160 min
= 2 hour 40 minutes
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