Accepted Answer
This problem has more holes than swiss cheese.ASSUME that the time he drives only depends on the distance he covers, and has nothing to do with his speed or how he drives.The race rules say he has to cover at least 50 km, so the minimum time he can drive is the solution to [ 50 = 3t + 47 ]Subtract 47 from each side:3 = 3tDivide each side by 3 :1 = t minimumHe has fuel for exactly 53 km, so the maximum timehe can drive is the solution to[ 53 = 3t + 47 ]Subtract 47 from each side :6 = 3tDivide each side by 3 :2 = t maximum