Explanation:

To solve this question, we can apply a short trick approach :\
If A and B together can do a piece of work in x day and A alone can do it in y days, then B alonecan do the work in 
xy /x-y days
Given,
Time taken by Raj and Ram together to finish a piece of work = x = 10 days
Time taken by Raj alone to finish the same piece of work = y = 12 days
By the short trick approach :
Ram alone can do the whole work in
10 x 12 /10 - 12 = 60 days