Walking at 70% of his usual speed a man takes 24 minutes more to cover a distance. What is his usual time to cover this distance? Answers:
A) 30
B) 36
C) 42
D) 48
E) 56
speed is inversly proprtional to time   walking at 70% of speed meand 7/10s takes 10/7t.   It takes 24 minutes extra to cover the distance. then   10/7t=t+24   10t=7t+168   3t=168   t=56.   Option 56 is correct
<result>E</result>
Walking at 70% of his usual speed a man takes 24 minutes more to cover a distance. What is his usual time to cover this distance?