Two housemates trade meal vouchers X and printing credits Y. Both have utility U=X^{1/2}Y^{1/2}. Their endowments are (4,6) and (2,12). Let p_Y=1. Find the competitive-equilibrium price p_X.

Please enter a number only. If your answer is a decimal, round it to no more than two decimal places. Do not include spaces, commas, letters, or special characters such as dollar signs.