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 option
A) 30
B) 36
C) 42
D) 48
E) 72

Rationale: "speed is inversly proprtional to time walking at 75 % of speed meand 3 / 4 s takes 4 / 3 t . it takes 24 minutes extra to cover the distance . then 4 / 3 t = t + 24 4 t = 3 t + 72 t = 72 option e is correct"
Answer: E