Answer:
dollars per mile
$0.90 per mile
Explanation:
Since you are interested in the price of a 42-mile ride, you need a unit cost of dollars per mile. The time the trip takes does not matter.
unit price in dollars per mile = (price)/(number of miles)
unit price = $50.40/(56 miles) = $0.90/mile
Answer the unit price is $0.90 per mile