**Q.Ram is twice as fast as Aman and Aman is thrice as fast as Rohit in doing a work. Working together they can finish the work in 10 days. In how many days can Aman and Rohit together finish the work. **

**A.**15

**B.**20

**C.** 25

**D.** 27

**E.** 32

Answer: 25 Days

Solution:

Let the Rohit one day work be ‘x’

Aman’s one day work be ‘3x’

Ram’s one day work be ‘6x’

Therefore, three can do this particular work together = 1/10

\begin{array}{l} \therefore x+3 x+6 x=\frac{1}{10} \\ \Rightarrow 10 x=\frac{1}{10} \\ \therefore x=\frac{1}{100} \end{array}

So, Aman and Rohit can do this work is 3x+x=1/100+1/100

\begin{array}{l} \Rightarrow 3x+x=\frac{1}{100} \\ \Rightarrow 4x=\frac{1}{100} \\ \therefore x=25 \text { Days } \end{array}

Hence, Aman and Rohit can do this work in 25 days