Justin takes three times as long to do a job as Carl does, suppose t represents the time it takes Carl to do the job. Then 3t represents the time it takes Justin. How long does it take Justin if Carl takes (a) 30 sec? (b) 90 sec? (c) 2 min?

Answer 1

3t =
3 * 30 = 90
3 * 90 = 180

Answer 2

is 90 sec