By walking at 3/4th of his usual speed, a man reaches office 15 minutes later than usual. What is his usual time?
Choices:
A) 45min B) 50min C) 65min D) 60min E) 70min
let T be the usual time.   time spent=4T/3   therefore, 4T/3=T+15   4T=3T+45..therefor T=45min   45minNSWER:45min
<result>A</result>
By walking at 3/4th of his usual speed, a man reaches office 15 minutes later than usual. What is his usual time?