Total time for solidification of a cubic casting of dimensions 5.0 cm×5.0 cm ×5.0cm is 1.6 min. A cylindrical riser with diameter to height ratio 0.5 is required so that the time for solidification of riser is 3.2 min. Applying Chvorinov’s law, the height of the riser (in cm) is _____ (answer up to two decimal places)

(Assume that exponent (n) in Chvorinov’s equation is 2)