Tatiana wants to run 5 miles at an average pace of 9 minutes per mile. after 4 miles, her average pace is 9 minutes 10 seconds. In how many minutes must she complete the final mile to reach her goal

Answer 1

The current time for the 4 miles is:

4 * ( 9 min 10 seconds) = 4 * (9*60+10) sec = 4 * (550 sec) = 2200 sec

The goal is

9 minutes per mile * 5 miles = 45 minutes = 45 *50 = 2700 sec

So she must run the last mile in 500 seconds = 8 and 1/3 min = 8 min 20 sec