71. A biologist discovered an amazing variety of amoebas. Each of them divided into two every minute. The biologist puts an amoeba in a test tube, and exactly an hour later, the test tube is filled with amoebas. How much time would it take for the entire test tube to be filled with amoebas if, instead of one, two amoebas were placed in it at the beginning?
71. At the beginning of the experiment, there is one amoeba in the test tube, after one minute there are already two, so 2 amoebas will fill the test tube in 59 minutes.