Walking at 75% of his usual speed a man takes 24 minutes more to cover a distance. What is his usual time to cover this distance? Choose the correct choice from the following answers:  A) 30  B) 36  C) 42  D) 48  E) 72
speed is inversly proprtional to time   walking at 75% of speed meand 3/4s takes 4/3t.   It takes 24 minutes extra to cover the distance. then   4/3t=t+24   4t=3t+72   t=72   Option 72 is correct
<result>E</result>
Walking at 75% of his usual speed a man takes 24 minutes more to cover a distance. What is his usual time to cover this distance?