Reema And Radha can reap a field in 20 Days. Radha can Reep 1/2 of it in 15Days by herself . if Reema works by herself how long will it take to reap the field ??
Answers
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good question
Given : Reema and radha can reap a certain field in 20 days.
radha can reap 1/2 of the field in 15 days.
To Find : If reema work by herself, how long will she take to reap the field
Solution:
radha can reap 1/2 of the field in 15 days.
=> radha can reap field in 15/(1/2) = 30 days
=> radha can reap in 1 day = 1/30
reema can reap field in D days
reema can reap field in 1 days = 1/D
radha and reema can reap field in 1 days = 1/30 + 1/D
Reema and radha can reap a certain field in 20 days.
=> Reema and radha can reap a certain field in 1days. = 1/20
1/30 + 1/D = 1/20
=> 1/D = 1/20 - 1/30
=> 1/D = (3 - 2)/60
=> 1/D = 1/60
=> D = 60
reema can reap field in 60 days
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