Question
‘X’ and ‘Y’ can do a task together in 15 days.
If ‘X’ alone takes 25 days to complete it, then how much time will ‘Y’ take to finish the task alone?Solution
ATQ,
Let total work = 75 units. {LCM (15 and 25)}
Combined efficiency = 75 ÷ 15 = 5 units/day
Efficiency of 'X' = 75 ÷ 25 = 3 units/day
Efficiency of 'Y' = 5 - 3 = 2 units/day
Time taken by 'Y' alone = 75 ÷ 2 = (75/2) days
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