Diesel Dan Is a Contract Truck Driver

Diesel Dan is a contract truck driver. While his revenue is $1.50 per mile driven, the faster he drives, the greater the risk of a speeding ticket. The cost of driving his truck 1 hour at a speed of S miles per hour is C(S) = . To maximize his profit, Dan should drive

A) 60.41 miles per hour.
B) 61.62 miles per hour.
C) 67.17 miles per hour.
D) 60 miles per hour.
E) 72.71 miles per hour.