Problems related to Ke & Half-life

Problem 01. Elimination half-life of a drug is 3 hours.

1. What is its Ke?
2. On a repeated dosage regimen, how long would be required for the peak plasma concentration to reach 97% of steady state? Hours? Half-lives?

Problem 02. Given an elimination rate constant of 0.07/h.

1. What is the elimination half-life?