The ratio of time taken by alone P, Q and R to complete the work is 10 : 15 : 12 respectively. If they work together then the work will be completed in 8 days. If P and Q work for 4 days and R joins them, then the remaining work will be completed in –
1
11/3 days
2
17/3 days
3
13/3 days
4
16/3 days
5
20/3 days