Question 907628
1/a+1/b=1/x
1/3+1/2=1/x
2/6+3/6=1/x
5/6=1/x
x=6/5
x=1.2 hours working together
check
x/a+x/b=1
x/3+x/2=1
1.2/3+1.2/2=1
0.4+0.6=1
1.0=1
ok