Ineed to know how to solve this problem for an upcoming exam

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block

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?