Iift 2018 Question 110
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IIFT
Total cost=Fuel cost+ Driver’s cost
Fuel cost=Total distance × Cost of Diesel per km
Fuel cost=1000×[1/400 {(1000/x)+x} ]×65
Fuel cost = 162500 x + 162.5/x
Now, substituting the values from the given choices we find that at x=36, total cost is minimum.
Hence. option B is correct.