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?	Choose one:
A) 30	B) 36	C) 42	D) 48	E) 56

Rationale: "speed is inversly proprtional to time walking at 70 % of speed meand 7 / 10 s takes 10 / 7 t . it takes 24 minutes extra to cover the distance . then 10 / 7 t = t + 24 10 t = 7 t + 168 3 t = 168 t = 56 . option e is correct"
Answer: E