A swimming pool whose volume is 10,000 gal contains water that is 0.03% chlorine. Starting at t = 0, city water containing 0.002% chlorine is pumped into the pool at a rate of 4 gal/min. The pool water flows out at the same rate. What is the percentage of chlorine in the pool after 1 hour? When will the pool water be 0.004% chlorine? What is the percentage of chlorine in the pool after 1 hour? After 1 hour the pool will be 0.0293 % chlorine. (Round to four decimal places as needed.) When will the pool water be 0.004% chlorine? The pool water will be 0.004% chlorine in hours. (Round to two decimal places as needed.)