Home
Class 10
MATHS
Narayan, standing in the midst of a fiel...

Narayan, standing in the midst of a field, observes a flying bird in his north at an angle of elevation of `30^@` and aft er 21 minutes he observes the bird in his south at an angle of elevation of `60^@`. If the bird flies in a s traight line all a height of `50sqrt3` metres, then find its speed in metre per minuts.

Text Solution

Verified by Experts

100 metres per minute
Promotional Banner

Topper's Solved these Questions

  • RIGHT CIRCULAR CYLINDER

    CALCUTTA BOOK HOUSE|Exercise Exercise - 2 (Long-answer type questions)|11 Videos

  • SIMILARITY

    CALCUTTA BOOK HOUSE|Exercise Exercise 5.2|27 Videos

Similar Questions

Explore conceptually related problems

Mohit, standing in the midst of a field, observes a flying birds in his north at an anlge of elevation of 30^@ and after 2 minutes he observes the birds in his south at an angle of elevation of 60^@ . If the bird flies in a straight line all along at a height of 50sqrt3 metres then find its speed in km//hr .

A man standing in the midst of a field observes, a flying bird in his north at an angle of elevation of 30^@ and after 2.5 minutes he observes the bird in his south at an angle of elevation of 60^@ . If the bird flies in a straight line all along at a height of 60sqrt3 metres, what is its speed?

Monu standing in the midst of a field, observes a flying bird in his north at an angle of elevation of 30^(@) and after 2 minutes he observer the bird in his south at an angle of elevation of 60^(@) . If the bird flies in a straight line all along at a height of 50sqrt(3) metres, find its speed in kilometre per hour.

The angle of elevation of a jet plane from a point on the ground is 60^@ . After a flight of 15 seconds, the angle of elevations changed to 30^@ . If the jet plane is flying horizontally at a constant height of 1500sqrt3 metres, find the speed of the jet plane.

The angle of elevation of a jet plane from a point A on the ground is 60^(@) . After a flight of 15 seconds, the angle of elevation changes to 30^(@) . If the jet plane is flying at a constant height of 1500sqrt3 meter, find the speed of the jet plane. (sqrt3 = 1.732)

A man, standing on the bank of a river observes that the angle of elevation of the top of a tree just on the opposite bank is 60^@ But the angle off elevations is 30^@ from a point at a distance y metres from the bank. Show that the height of tree h= sqrt(3y)/2.

A man standing on a railway overbirdge of 5sqrt3 m height observed the engine of the train from one side of the bridge at an angle of depression of 30^@ . But just after 2 seconds, he observed the engine at an angle of depression of 45^@ from the other side of the bridge. Find the speed of the train.

Laxmidevi standing on a railway overbridge of 5sqrt(3) metres height observed the engine of the train from one side of the bridge of depression of 30^(@) . But just after 2 seconds, she observed the engine at an angle of depression of 45^(@) from the other side of the bridge. Find the speed of the train in metres per second.

From the bottom of a 'tila' the angle of elevation of its unreachable top is 45^@ . After moving 100 metre along the 'tila' the angle of elevation becomes 60^@ . Find the height of the tila? [sqrt3 = 1.732]

A passenger of an aeroplane observes that Howrah station is at one side of the plane and Saheed minar is just one the opposite side. The angles of depression of Howrah station and Saheed minar from the passenger of aeroplane are 60^@ and 30^@ respectively. If the aeroplane is at a height of 545sqrt3 metres at that time, then find the distance between Howrah Stateion and Sahed minar.

CALCUTTA BOOK HOUSE-SAMPLE QUESTIONS PAPERS-QUESTION
  1. Prove that "cosec"^2""24 cot^2""66^@ = sin^(2)24^@ +sin^2 ""66^@+cot^2...

    Text Solution

    |

  2. The heights of two towers are 210 metres and 70 metres respectively. ...

    Text Solution

    |

  3. Narayan, standing in the midst of a field, observes a flying bird in h...

    Text Solution

    |

  4. The length of circumference of the base of a right circular cylinder i...

    Text Solution

    |

  5. If the ratio of the radii of two spheres be 1 : 2, then find the ratio...

    Text Solution

    |

  6. If the circumference of the bases of a right circular cone 2*2 metres ...

    Text Solution

    |

  7. sqrt6xx sqrt15=xsqrt10.then find the value of x.

    Text Solution

    |

  8. Subtract the number (7-sqrt3) and (3+sqrt3)

    Text Solution

    |

  9. Subtract the number (10-sqrt11) and (-5+3sqrt11)

    Text Solution

    |

  10. The present price of a machine is ₹ 2V. If the price of the machine de...

    Text Solution

    |

  11. Falgumni, Shreya and Smita started a partnership bussiness ₹ 6000. At ...

    Text Solution

    |

  12. If p+q = sqrt(13) and p-q = sqrt(5), then the value of 2pq is

    Text Solution

    |

  13. In the trapezium ABCD, AB"||"CD and two points P and Q are on the side...

    Text Solution

    |

  14. Which one of the followings is correct ?

    Text Solution

    |

  15. If 35 is Removed from the Data: 30, 34, 35, 36, 37, 38, 39, 40, Then t...

    Text Solution

    |

  16. A man who takes a loan is called………..

    Text Solution

    |

  17. If x prop y and x prop z, tehn ( y + z) prop………..

    Text Solution

    |

  18. All of the diameters of the circle passes through the…………

    Text Solution

    |

  19. The sexagesimal value of the supplementary angle of (3pi)/8 is ……………

    Text Solution

    |

  20. The volume of the gratest solid cone that can be cut of from a solid h...

    Text Solution

    |