By walking at 3/4th of his usual speed, a man reaches office 18 minutes later than usual. What is his usual time?  Choose the correct choice from the following answers.
A) 43min  B) 54min  C) 65min  D) 60min  E) 70min
let T be the usual time.   time spent=4T/3   therefore, 4T/3=T+18   4T=3T+54...therefor T=54min   ANSWER:54min
<result>B</result>
By walking at 3/4th of his usual speed, a man reaches office 18 minutes later than usual. What is his usual time?