Kepler’s third law of planetary motion may be given as T = kr^3/2 , where T is the time for one revolution of a planet around the sun, r is its mean radius from the sun, and k = 1.115 × 10⁻¹²  year/mi^3/2. Find the time for one revolution of Venus about the sun if r = 6.73 × 10⁷mi.