walking at 5 / 6 th of its usual speed a cab is 12 mnts late . find its usual time to cover the journey ?
"new speed = 5 / 6 th of usual speed new time = 6 / 5 th of usual time 6 / 5 ut - ut = 12 m ut / 5 = 12 m ut = 60 m answer is e"
multiply(5, 12)