My friend kicked me out of his zoom, and I can't get back in. What do I do? I call him MM, so if MM reads this, let me in please. Or tell me what I did wrong. Only answer if you have an answer please

Aswimming pool whose volume is 10 comma 000 gal contains water that is 0.01% chlorine. starting at tequals0, city water containing 0.003% chlorine is pumped into the pool at a rate of 5 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 0.006% chlorine?