Ram, Salim and David can do a work separately in 10, 20, 20 days. When they work together, total

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13 Nov 2010 How many days required?

Ram, Salim and David can do a work separately in 10, 20, 20 days. When they work together,
total days required to complete the work is

OPtion

1) 14
2) 6
3) 8
4) 9
5) 10
6) 12
7) 5
8) 4
9) 3
10) 2

Solution

One day work of the 3 persons together = (1/10) + (1/20) + (1/20)
= 1/5
Hence total days required are 5

Correct Option: 7 Best Solution (1)