Multiple choice

Praful has done 1/2 of a job in 30 days, Sarabjit completes the rest of the job in 10 days. In how many days can they together do the job?

  1. 30 days

  2. 45 days

  3. 15 days

  4. 60 days
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Praful does 1/2 of the job in 30 days, so he takes 60 days to complete the whole job. Sarabjit completes the remaining 1/2 in 10 days, so he takes 20 days to complete the whole job. Their combined daily rate is 1/60 + 1/20 = 1/60 + 3/60 = 4/60 = 1/15, meaning they take 15 days together.

AI explanation

Praful's full work rate is 1/2 job in 30 days, meaning he takes 60 days to complete the entire job alone for a daily rate of 1/60. Sarabjit completes the remaining 1/2 job in 10 days, meaning he takes 20 days for the full job for a daily rate of 1/20. Their combined one day work is 1/60 + 1/20 = 1/15. They together will complete the job in 15 days.

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