A alone can do a piece of work in 7 days, while B alone can do it in 10 days. In how many days will they complete the same work if they both work together?
1
\(\frac{{105}}{{17}}\) days
2
\(\frac{{35}}{{17}}\) days
3
\(\frac{{70}}{{17}}\) days
4
\(\frac{{84}}{{17}}\) days