A, B, and C can finish a task individually in 1.6a, 2.4a, and 1.2a days respectively. If A and B, working together, can complete the same task 3 days quicker than C working alone, how long would it take for B and C to complete the same work if they were working together?
1
30 days
2
20 days
3
15 days
4
12 days
5
10 days