A, B and C can complete a certain work in 10, 15 and 20 days respectively. B and C started the work but both left after 5 days. In how many days, A alone will complete the remaining work?
1
\(\frac{23}{6}\)
2
\(\frac{15}{4}\)
3
\(\frac{25}{6}\)
4
\(\frac{13}{3}\)