Rakesh can do a work in 20 days , Vasant in 15 days and Ravi in 10 days . They…
2025
Rakesh can do a work in 20 days , Vasant in 15 days and Ravi in 10 days . They all start the work together, but Rakesh leaves after 4 days and Vasant leaves 3 days before the work is completed. In how many days is the work completed ?
- A.
6
- B.
7
- C.
8
- D.
4
Attempted by 54 students.
Show answer & explanation
Correct answer: A
Ans: 6
Let the work is completed in x days, then
Rakesh's 4 day work + Vasant's (x-3) days work + Ravi's
x day work = 1
=> 4/20 + (x - 3) / 15 + x / 10 = 1
=> 10x / 60 = 1
=> x = 6