A is twice as a good worker as B and together they finish the work in 20 days. In how many days can A alone do it?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 30 days.
The efficiency of B = 1 unit/hour then,
The efficiency of A = 2 units/hour
Total work = 20 × 3 = 60 units
Time taken by A = 60/2 = 30 days