Question 1197850
<pre>
CREW        RATE         
A           2/5           
B           3/7           
A and B    29/35   
</pre>

Combined Rate A and B
{{{2/5+3/7}}}

{{{14/35+15/35}}}

{{{29/35}}}

B worked 10 hours longer than both crews combined.
The two crews made 100 cars.


Time for B alone to finish, x+10
Time A and B together, x

{{{highlight_green((29/35)x+(3/7)*10=100)}}}---- B worked 10 hours beyond A.
unfinished -- 
x=115.5 days
seems strange