It can be easily assumed that most information's are already given in the question. Based on those information's, the answer can be deduced.
rt = [(3/4)r] * (t + 12) 4rt = 3r (t + 12) 4rt = 3rt + 36r 4rt - 3rt = 36r rt = 36r t = 36 From the above deduction we can conclude that the time taken by Carmen to ride to the market is 36 minutes Then Time taken by Carmen to ride home = 36 + 12 = 48 minutes
