We Are Not Afraid To Die..If We Can All Be Together || Three Yera Long Voyage

To complete a certain work, C working alone takes twice as long as A and B working together. A working alone takes 3 times as long as B and C working together. All the three together can complete the work in 5 days. How long would each take to complete th work individually?

If all the letters of the word ARRANGE are arranged in all possible ways,in how many of words we will have the A's not together and also the R's not together?