Deepa rides her car at 25 km/hr.She has to spend 2 Rs per km on diesel and if she rides it at a faster speed of 40 km/hr, the diesel cost increases to 5 Rs per km. She has 100 Rs to spend on diesel. Let she travels x kms with speed 25 km/hr and y kms with speed 40 km/hr. The feasible region for the LPP is shown below.

Based on the above information answer the following questions
if Z = 6x - 9y be the objective function, then maximum value of Z is

Options

A. -20
B. 150
C. 180
D. 20