A alone can finish a work in 12 days and b can do it in 15 days.how much time they take to do it,if both a and b work together
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A alone can finish a work in 12 days
A in 1 day does 1/12 work
B alone can finish work in 15 days
B in 1 day can do 1/15 work
Together in 1 day, A and B do: 1/12 + 1/15 = 9/60 = 3/20 work
3/20 work == 1 day
1 work== x days
x= 20/3 days
A in 1 day does 1/12 work
B alone can finish work in 15 days
B in 1 day can do 1/15 work
Together in 1 day, A and B do: 1/12 + 1/15 = 9/60 = 3/20 work
3/20 work == 1 day
1 work== x days
x= 20/3 days
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Answer is 20/3 days.
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