alok takes 20 days to finish a work while shankar takes 15 days harish work twice as faat as alok in how many days al of them of them in same work
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Alok takes 20 days
⇒ 1 day = 1/20 of the work
Shanker takes 15 days
⇒ 1 day = 1/15 of the work
Harish is twice as fast as Alok:
⇒ 1 day = 1/20 x 2 = 1/10 of the work
In all the 3 worked together:
1 day = 1/20 + 1/15 + 1/10 = 13/60
Find the number of days needed to complete the work:
13/60 = 1 day
1/60 = 1 ÷ 13 = 1/13 day
60/60 = 1/13 x 60 = 4.6 = 5 days
Answer: They need 5 days to complete the work.
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