Question
'Meera', 'Kiran', and 'Suman' together can complete a work
in 30 days. 'Meera' and 'Kiran' together can complete the same work in 90 days. 'Suman' alone can finish the same work in how many days?Solution
ATQ,
Let the total work = 90 units (LCM of 30 and 90)
Combined efficiency of 'Meera' and 'Kiran' = (90/90) = 1 unit/day
Combined efficiency of 'Meera', 'Kiran', and 'Suman' = (90/30) = 3 units/day
Efficiency of 'Suman' = 3 - 1 = 2 units/day
Time taken by 'Suman' to complete the work alone = (90/2) = 45 days
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