Home
Class 12
MATHS
The fuel charges for running a train are...

The fuel charges for running a train are proportional to the square of the speed generated in km/h, and the cost is Rs. 48 at 16 km/h. If the fixed charges amount to Rs. 300/h, the most economical speed is (a) 60 km/h (b) 40 km/h 48 km/h (d) 36 km/h

Promotional Banner

Topper's Solved these Questions

  • 3D COORDINATION SYSTEM

    CENGAGE PUBLICATION|Exercise DPP 3.1|11 Videos
  • APPLICATION OF INTEGRALS

    CENGAGE PUBLICATION|Exercise All Questions|143 Videos

Similar Questions

Explore conceptually related problems

A boy goes to school from his home at a speed of x km/h and comes back at a speed of y km/h, then his average speed is-

The cost of fuel of an engine varies as the square of its velocity and the cost of fuel is ₹ 48 per hour when the velocity is 16 km per hour. If other expenses be ₹ 300 per hour, then show that the most economical velocity for a journey of a given distance is 40 km per hour.

A train travels 360 km at a uniform speed. If the speed had been 5 km/h more, it would have taken 1 hour less for the same journey. Find the speed of the train.

A man travels a certain distance with a uniform speed of 5 km/h ad returns the same distance with a uniform speed of 4km/h. What is the average speed of the man?

I covered a distance of 12 km. in 40 min. in a bus. Let's find the speed of the bus in km/hr.

A passenger in a train found that the train took 15 sec. to pass the platform. If the speed of train is 60 km. per hours, let us find the length of the platform.

A boy goes to school from him home at a speed of x km/hr. and comes back at a speed of y km/hr. then the average speed of the boy is given by

CENGAGE PUBLICATION-APPLICATION OF DERIVATIVES-All Questions
  1. A bell tent consists of a conical portion above a cylindrical portion ...

    Text Solution

    |

  2. A rectangle is inscribed in an equilateral triangle of side length 2a ...

    Text Solution

    |

  3. The fuel charges for running a train are proportional to the square of...

    Text Solution

    |

  4. A cylindrical gas container is closed at the top and open at the botto...

    Text Solution

    |

  5. In a triangleA B C ,/B=90^0 and b+a=4. The area of the triangle is ma...

    Text Solution

    |

  6. The three sides of a trapezium are equal, each being 8cm. The area of ...

    Text Solution

    |

  7. A rectangle with one side lying along the x-axis is to be inscribed in...

    Text Solution

    |

  8. A right triangle is drawn in a semicircle of radius 1/2 with one of ...

    Text Solution

    |

  9. The least area of a circle circumscribing any right triangle of area 9...

    Text Solution

    |

  10. The least integral value of x where f(x)=(log)(1/2)(x^2-2x-3) is monot...

    Text Solution

    |

  11. L e tf(x)={x+2 , x <-1 ; x^2 , -1 lt= x < 1 and (x-2)^2 , ...

    Text Solution

    |

  12. Number of integral values of b for which the equation (x^3)/3-x=b has ...

    Text Solution

    |

  13. Let f(x)={x^(3/5),ifxlt=1and (x-2)^3,ifx >1 Then the number of c...

    Text Solution

    |

  14. The number of nonzero integral values of a for which the function f(x)...

    Text Solution

    |

  15. Prove that the minimum value of ((a+x)(b+x))/((c+x))a ,b > c ,x > -c ...

    Text Solution

    |

  16. Let f(x)={|x^2-3x|+a ,0lt=x<3/2 -2x+3,xgeq3/2 If f(x) has a local ma...

    Text Solution

    |

  17. The largest term in the sequence an=(n^2)/(n^3+200) is given by (a)(...

    Text Solution

    |

  18. The least value of a for which the equation 4/(sinx)+1/(1-sinx)=a ha...

    Text Solution

    |

  19. Let f be a continuous, differentiable, and bijective function. If the ...

    Text Solution

    |

  20. Let f(x)=xsqrt(4a x-x^2),(a >0)dot Then f(x) is (a). increasing in (0,...

    Text Solution

    |