Answer:
C. $3 per hour
Explanation:
Data given in the question
Travelling cost by air = $300
Time taken by air = 6 hours
Ticket cost of bus = $50
Time taken by bus = 56 hours
Now
The additional amount paid for the air travel
= $300 - $150
= $150
And,
Time saved from the Air travel
= 56 hours - 6 hours
= 50 hours
Hence,
The minimum value of one's time
= Additional Cost paid ÷ saving time
= $150 ÷ 50
= $3 per hour