Home
Class 8
MATHS
Mohan takes 9 hours to mow a large lawn....

Mohan takes 9 hours to mow a large lawn. He and Sohan together can mow it in 4 hours. How long will Sohan take to mow the lawn if he works alone?

Text Solution

Verified by Experts

Let the total work in lawn be `36` unit.
Mohan takes `9`hours so its efficiency is `4` unit.
Both mohan and sohan both takes `4` hours so their efficiency is `9` unit.
Only efficiency of sohan is (efficiency of both - efficiency of mohan)
`(9-4 =5)`unit.
Time taken by sohan to complete the work is `36/5` hours.
Promotional Banner

Topper's Solved these Questions

  • SQUARES AND SQUARE ROOTS

    RD SHARMA|Exercise All Questions|183 Videos

  • UNDERSTANDING PHASE-II (QUADRILATERALS)

    RD SHARMA|Exercise All Questions|46 Videos

Similar Questions

Explore conceptually related problems

A alone can complete a work in 12 days. A and B together can complete it in 8 days. How long will B alone take to complete the work?

Quantity I: A and B together can do a pices of work in 4 days. If A alone can do the same work in 6 days, then B alone can do the same work in? Quantity II: A can do a pices of work in 4 hours, B and C together can do it in 3 hours, while A and C together can do it in 2 hours. How long will B alone take to do it ?

Ravi can do a piece of work in 15 hours while Raman can do it in 12 hours. How long will both take to do it, woking together?

A can do a piece of work in 4 hours, B and C together in 3 hours, and A and C together in 2 hours. How long will B alone take to do it? 8 hou r s b. 10 hou r s c. 12 hou r s d. 24 hou r s

RD SHARMA-TIME AND WORK-All Questions
  1. Rohan can paint 1/3 of a painting in 6 days. How many days will he tak...

    Text Solution

    |

  2. Anil can do a piece of work in 5 days and ankur in 4 days. How long wi...

    Text Solution

    |

  3. Mohan takes 9 hours to mow a large lawn. He and Sohan together can ...

    Text Solution

    |

  4. Sita can finish typing a 100 page document in 9 hours, Mita in 6 ho...

    Text Solution

    |

  5. A ,\ B\ a n d\ C working together can do a piece of work in 8 hours. A...

    Text Solution

    |

  6. A and B can do a piece of work in 18 days .B and C in 24 days and A an...

    Text Solution

    |

  7. A and B can do a piece of work in 12 days. B and C in 15 days. C and ...

    Text Solution

    |

  8. A,B,and C can reap a field in 15^(3/4) days; B,C and D in 14 days; C,D...

    Text Solution

    |

  9. A and B can polish the floors of a building in 10 days. A alone can do...

    Text Solution

    |

  10. A and B can finish a work in 20 days. A alone can do 1/5th of the work...

    Text Solution

    |

  11. A and B do a piece of work in 20 days and B in 15 days. They work toge...

    Text Solution

    |

  12. A and B can do a work in 45 and 40 days respectively. They began the w...

    Text Solution

    |

  13. Aasheesh can paint his doll in 20 minutes and his sister Chinki can do...

    Text Solution

    |

  14. A and B can do a piece of work in 6 days and 4 days respectively. A st...

    Text Solution

    |

  15. 6 men can complete the electric fitting in a building in 7 days. How m...

    Text Solution

    |

  16. If 36 men can do a piece of work in 25 days, in how many day will 15 m...

    Text Solution

    |

  17. Geetika weaves 20 baskets in 30 days .In how many days she will weave ...

    Text Solution

    |

  18. Neha types 75 pages in 14 hours. How many pages will she type in 20 ho...

    Text Solution

    |

  19. If 12 boys earn Rs. 840 in 7 days, what will 15 boys earn in 6 days?

    Text Solution

    |

  20. If 25 men earn Rs 1000 in 10 days, how much will 15 men earn in 15 day...

    Text Solution

    |