It Took 80 Hours of Analysis to Complete the First

Multiple Choice

It took 80 hours of analysis to complete the first phase,but the second phase was done in 74 hours.If this learning rate continues,then the 8^th analysis should take a mere:

A) 63 hours and 20 minutes,give or take.
B) 68 hours and 30 minutes,give or take.
C) 57 hours and 15 minutes,give or take.
D) 52 hours and 45 minutes,give or take.