Suppose the Price of an Airline Ticket from Dallas to Boston

Multiple Choice

Suppose the price of an airline ticket from Dallas to Boston costs $600. A bus ticket costs $150. Traveling by plane takes 6 hours compared with 51 hours by bus. Other things constant, an individual would gain by choosing air travel if, and only if, his time were valued at more than

A) $6 per hour.
B) $8 per hour.
C) $10 per hour.
D) $15 per hour.