walking at 5 / 6 th of its usual speed a cab is 6 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 = 6 m ut / 5 = 6 m ut = 30 m answer is b"
multiply(5, 6)