Question 903750
1/a+1/b=1/x
1/8+1/12=1/x
1/8+1/12=1/4.8
1/x=1/4.8
x=4.8 days working together
check
1/a+1/b=1/x
1/8+1/12=1/x
12/96+8/96=1/x
20/96=1/x
96/20=x
x=4.8 days working together
ok