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I believe that the answer is c but if you wanted to make sure you could figure out the correlation on a graphing calculator.
X represent the number of laps Marcy swam, 1 1/4x represent the number of times Toni swam.
20 + 0.80(1 1/4x) + 15 + 0.85x = 257
20 + x + 15 + 0.85x = 257
1.85x + 35 = 257
Required equation is 1.85x + 35 = 257
0.2 miles per minute.
3.6 divided by 18 equals 0.2/
