Running 3/4th of his usual rate, a man is 9min late. Find his usual time in hours ?	Choose the correct option:
A) 6/4 hrs B) 3/4 hrs C) 9/20 hrs D) 3/4 hrs E) 1/4 hrs
Explanation:   Walking at 3/4th of usual rate implies that time taken would be 4/3th of the usual time. In other words, the time taken is 1/3rd more than his usual time   so 1/3rd of the usual time = 9min   or usual time = 3 x 9 = 27min = 27/60 hrs = 9/20 hrs.   Answer: 9/20 hrs
<result>C</result>
Running 3/4th of his usual rate, a man is 9min late. Find his usual time in hours ?