19.25 Diesel Dan is a contract truck driver.While his revenue is $2.50 per mile driven, the faster
he drives, the greater the riskof a speeding ticket. The cost of driving his truck one hour at a
speed of S miles per hour is
C(S) = eS-(60/3)

To maximize his profit, Dan should drive

(a) 60 miles per hour.

(b) 60.92 miles per hour.

(c) 62.75 miles per hour.

(d) 66.04 miles per hour.

(e) 70.20 miles per hour.