An Employee of a Delivery Company Earns $\$$ 2500 Per Hour Driving a Delivery Van in an Area

Multiple Choice

An employee of a delivery company earns $\$$ 25.00 per hour driving a delivery van in an area where gasoline costs $\$$ 2.90 per gallon. When the van is driven at a constant speed s (in miles per hour, with $45 \leq s \leq 60$ ) , the van gets $\frac { 290 } { s }$ miles per gallon. Determine the most economical speed s for a 100-mile trip on an interstate highway.

A) The most economical speed is 52.0 mph.
B) The most economical speed is 48.0 mph.
C) The most economical speed is 25.0 mph.
D) The most economical speed is 50.0 mph.
E) The most economical speed is 53.0 mph.