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12 workers take 4 hours to complete a job. Then find the number of days that would it take 15 workers to complete the job from the option below:

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2 hours 40 minutes

3 hours 12 minutes

3 hours 24 minutes

3 hours 30 minutes

answer is B.

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Detailed Solution

It is given that,

12

workers take

4

hours to complete the job.
Calculate the time taken by

1

man to complete the job is,

4 × 12 = 48

hours.
We know that, 1 hour = 60 minutes.
So,

48 × 60 = 2880

minutes.
To find the number of days taken by 15 workers.
Calculate the number of time taken by

15

men to complete the job.

= 288015

minutes

= 192

minutes
Since

1

hour

= 60

minutes,
Convert

192

minutes into hour by dividing it by

60

19260 = 3

hours and 12 minutes.
= 3 hours and 12 minutes
Hence option 2) is correct.

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