Correct Answer - Option 2 : 64/5 days
Given:
Kunal's efficiency = (Arun's efficieny)/4
Calculation:
Arun completes work alone = 4 × 16 = 64 days
Work done by Kunal in 1 day = (1/16)
Work done by Arun in 1 day = (1/64)
Work done by Kunal and Arun in 1 day = (1/16) + (1/64)
⇒ (4 + 1)/64
⇒ 5/64
⇒ 64/5 days
Formula used
If X is ‘a’ times efficient than Y, and can complete work in y days, then formula for calculating the number of days, if both work together will be as follows:
[(ay)/(a + 1)] days
Calculation:
Number of days taken by Suman and Karan works together = [(4 × 16)/(4 + 1)]
⇒ 64/5 days
