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39 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work? 10 B. 13 C. 14 D. 15












39 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?


















10 B. 13
C. 14 D. 15

Grade:upto college level

1 Answers

Radhika Batra
247 Points
8 years ago

Answer: Option B

Explanation:

Let the required number of days be x.

Less persons, More days (Indirect Proportion)

More working hours per day, Less days (Indirect Proportion)

Persons 30 : 39 :: 12 : x
Working hours/day 6 : 5

 30 x 6 x x = 39 x 5 x 12

 x = (39 x 5 x 12)
(30 x 6)

 x = 13.

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