Question 1091555
M = C+9
M+C = 81/3 = 27
C+9+C = 27
2C = 18
C = 9
and M = C+9 = 9+9 = 18
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Check:
3 hours at 9 mph = 27
3 hours at 18mph= 54
Total . . . . . . 81 Correct