Walking at 5/6th of its usual speed a cab is 15mnts late. Find its usual time to cover the journey? Pick one:
A) 25 m  B) 45 m  C) 32 m  D) 75 m  E) 62 m

Rationale: new speed = 5 / 6 th of usual speed new time = 6 / 5 th of usual time 6 / 5 ut - ut = 15 m ut / 5 = 15 m ut = 75 m answer is d
Answer: D