To do a certain work, B would take time thrice as long as A and C together and C twice as long as A and B together. The three men together complete the work in 10 days. The time taken by A to complete the work separately is

Explanation:

According to question,

Since we know, efficiency of persons will remain same. so we will balance it.

Now we can see, B’s efficiency is 3 units and C’s is 4 units and total is 12 units. So A’s efficiency is 12−4−3=5 units

Total work = 10days×12units

A can complete separately in

T.W\ efficiency of A=120\5=24 days