Question 110

# Land Cruiser Prado, the latest SUV from Toyota Motors, consumes diesel at the rate of $$\frac{1}{400}\left\{ \frac{1000}{x} + x\right\}$$litres per Km. when travelling at the speed of x km/hr. The diesel costs Rs. 65 per litre and the driver is paid Rs. 50 per hour. Find the steady speed that will minimize the total cost of a 1000 km trip?

Solution

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.

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1 year, 8 months ago

Solution toh batao

1 year, 8 months ago

Gandu salein

##### Mohit Mantry

1 year, 10 months ago

chutiyon solution to btao.

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