Question

An employee of a delivery company earns 22.50 per hour driving a delivery van in an area where gasoline costs 2.50 per gallon. When the van is driven at a constant speed s (in miles per hour, with ), the van gets miles per gallon. Determine the most economical speed s for a 100-mile trip on an interstate highway.
A) The most economical speed is 47.0 mph.
B) The most economical speed is 43.0 mph.
C) The most economical speed is 22.5 mph.
D) The most economical speed is 45.0 mph.
E) The most economical speed is 48.0 mph.

Answer

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