Home
Class 10
MATHS
A man rowing at the rate 4 km an hour ta...

A man rowing at the rate 4 km an hour takes thrice as much time to go 30 km up a river as in going 30 km down. Find the rate at which the river flows.

Text Solution

Verified by Experts

The correct Answer is:
2 km/hr;
Promotional Banner

Topper's Solved these Questions

  • QUADRATIC EQUATION IN ONE VARIABLE

    CALCUTTA BOOK HOUSE|Exercise EXERCISE-1.4|28 Videos

  • QUADRATIC EQUATION IN ONE VARIABLE

    CALCUTTA BOOK HOUSE|Exercise EXERCISE-1.5|40 Videos

  • QUADRATIC EQUATION IN ONE VARIABLE

    CALCUTTA BOOK HOUSE|Exercise EXERCISE-1.2|26 Videos

  • PYTHAGORAS THEOREM

    CALCUTTA BOOK HOUSE|Exercise EXAMPLE 6|4 Videos

  • QUADRATIC SURDS

    CALCUTTA BOOK HOUSE|Exercise Exercise -3.2|28 Videos

Similar Questions

Explore conceptually related problems

A man of height 2 metres walks at a uniform speed of 5 km/h away from a lamp post which is 6 metres high. Find the rate at which the length of his shadow increases.

A moter boat whose speed is 18 km/hr in still water takes 1 hour more to go 24 km upstream than to return down stream to same spot. Find the speed of steam____

Starting at 10a.m., a man walks at the rate of 5km/hr. Starting 2 hours later another man follows him on bicycle at the rate of 7km/hr. Determine when and where they will meet.

A boat travels 64 km in 16 hours in favor of the current and 24 km in 8 hours against the current of the river. Find the velocity of the boat in steady water and the velocity of the current with the help of graph.

A motor boat whose speed is 18 km/h in still water. It takes 1 hour more to go 24 km upstream than to return downstream to the same spot. Find the speed of the stream.

Two cars start moving from the junction point of two perpendicular roads with velocity 30 km/h and 40 km/h. The rate at which thay are separating is

An aeroplane is flying horizontally at a height of 2/3k m with a velocity of 15 km/h. Find the rate at which it is receding from a fixed point on the ground which it passed over 2 min ago.

A man is moving away from a tower 41.6 m high at the rate of 2 m/sec. Find the rate at which the angle of elevation of the top of tower is changing, when he is at a distance of 30m from the foot of the tower. Assume that the eye level of the man is 1.6m from the ground.

CALCUTTA BOOK HOUSE-QUADRATIC EQUATION IN ONE VARIABLE-EXERCISE-1.3
  1. The sum of the ages of a father and his son is at present 50 years. Wh...

    Text Solution

    |

  2. The sum of two numbers is equal to 80. Three times of the difference o...

    Text Solution

    |

  3. The sum of the two digits of a two digits' number is 9. if the digits ...

    Text Solution

    |

  4. If 1 is subtracted from the numerator and 2 is added to the denomenato...

    Text Solution

    |

  5. If 2 is subtracted from the numerator and 3 is added to the demoenator...

    Text Solution

    |

  6. A two digits number is 3 times of the sum of its digits. If the digits...

    Text Solution

    |

  7. If the digits of a two digits' number are interchanged, then the numbe...

    Text Solution

    |

  8. The tens' digit of a two digits number is twice of its unit digit. If ...

    Text Solution

    |

  9. If a two digits' number is divided by the sum of digits, the quotient ...

    Text Solution

    |

  10. Rahul said to Rohan. ''I am twice as old as you were when I was as old...

    Text Solution

    |

  11. Fill the blank: Roots of the equation x^2=6x are

    Text Solution

    |

  12. A man rowing at the rate 4 km an hour takes thrice as much time to go ...

    Text Solution

    |

  13. A boat goes up-stream 30 kilometres and down-stream 44 kilometres in 1...

    Text Solution

    |

  14. A boy was aksed to add 3 to a certain number and to divide the sum by ...

    Text Solution

    |

  15. Milk and water are mixed in two pots at the ratios 2:3 and 5:4. In wha...

    Text Solution

    |

  16. A box contains one rupee, fifty paise and twenty five paise coins. The...

    Text Solution

    |

  17. The three sides of a triangle are (x+5), (4x-y) and (y+2) centimetres ...

    Text Solution

    |

  18. If the length of a rectangle is decreased by 5 metres and the breadth ...

    Text Solution

    |

  19. The monthly income of two brothers is RS 1550. One of them gives half ...

    Text Solution

    |

  20. The total monthly salary of two persons is RS 7500. They spend 90% and...

    Text Solution

    |