1) DRINKING AND DRIVING: The alcohol levels A (t) in the bloodstream of a drinker follows the exponential decay law: A(t) = Ae, where t is the time in hours and k> 0 is a constant that depends on the individual drinker. If the legal driving limit for alcohol level is 0.08, find how long should a drinker has to wait (after his/her last drink) before he/she will legally be able to drive? If the present level of alcohol in his/her bloodstream is: a) b) 0.24 (milligram of alcohol per milliliter of blood) 0.32 (milligram of alcohol per milliliter of blood) c) 0.40 (milligram of alcohol per milliliter of blood) d) 0.64 (milligram of alcohol per milliliter of blood) [Let k = 0.47. Give answer in hours to two decimal places.]