Question 907353
1/a+1/b=1/x
1/2+1/8=1/x
8/16+2/16=1/x
10/16=1/x
x=16/10
x=1.6 hours working together
check
x/a+c/b=1
1.6/2+1.6/8=1
.8+.2=1
1=1
ok