Given:
No of days taken by Saurabh = 30
No of days taken by Kirpal = 20
Formula used:
No of days taken = Total work/One-day efficiency
Solution:
Let the total work be = 1 unit
Work done by Saurabh in one day = 1/30
Work done by Kirpal in one day = 1/20
Combined work done by Saurabh and Kirpal in one day = 1/30 + 1/20 = 5/60
∴ No of days taken by both of them working together = 1÷ 5/60 = 60/5
=> 12 days
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