Alok takes 20 days to finish a piece of work while shankar takes 15 days to finish the same piece of work. harish work twice as fast as alok. in how many days will all three of them together can finish the same piece of work?
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Alok = 20 days.
Shankar = 15 days
Harish = twice as fast as Alok.
In one day Alok does :
1/20.
In one day Harish does twice of this :
1/20 × 2 = 2/20 = 1/10 of the work.
It means Harish takes 10 days.
All of them working together :
1/10 + 1/20 + 1/15 = (6 + 3 + 4) / 60
= 13/60
= 60/13 days
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