def imperial_divide(l1, l2):
    """Divides a number into a number of feet and inches

        Parameters
        ----------
        l1: tuple
            A length in the form (feet, inches)
        l2: tuple
            A length in the form (feet, inches)

        Returns
        -------
        ret : scalar
            Return is a scalar representing Length 1 divided by length 2 
            (units cancel). 
    """
    total = float(l1[0] * 12 + l1[1]) / float(l2[0] * 12 + l2[1])
    return total
