Given:
The efficiency of Monika = 2 × efficiency of Ritu
Concept used:
When work done is same, efficiency ∝ (1/time)
Work = time × efficiency
Solution:
The ratio of efficiency of Monika to Ritu = 2 ∶ 1
The ratio of time taken by Monika and Ritu = 1 ∶ 2
Difference in time taken by Ritu and Monika = 2 - 1 = 1 unit
The difference in time taken by Ritu and Monika = 60 days
1 unit → 60 days
Then, 2 units → 120 days
Time taken by both together to finish the work
English
80 Questions
160 Marks
60 Mins English English20 Questions40 Marks12 Mins English English80 Questions160 Marks60 Mins EnglishX alone can complete a work in 56 days and Y alone can do it in 72 days. both completed in:
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