'P' alone can do a piece of work in 't' days and with the help of 'Q', he can complete the same work in 6 days. If the share of 'P' and that of 'Q' is Rs. 30 and Rs. 20 respectively then find the value of 't'?
1
8 days
2
9 days
3
10 days
4
12 days
5
15 days