Mathematics10 boys can dig a pitch in 12 hours. How long will 8 boys take to do it?

10 boys can dig a pitch in 12 hours. How long will 8 boys take to do it?


  1. A
    15 hrs
  2. B
    16 hrs
  3. C
    17 hrs
  4. D
    18 hrs 

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    Solution:

    Given, 10 boys can dig a pitch in 12 hours.
    By using the unitary method,
    Time taken by one boy to dig a pitch = 10×12=120 hrs.
    So, the time taken by 8 boys is 1208=15 hrs.
    Hence, option 1 is correct.
     
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