walking with 4 / 5 of my usual speed , i miss the bus by 3 minutes . what is my usual time ?
speed ratio = 1 : 4 / 5 = 5 : 4 time ratio = 4 : 51 - - - - - - - - 3 4 - - - - - - - - - ? è 12 answer : e
multiply(divide(3, divide(5, 4)), 5)