Question 904927
1/a+1/b=1/x
1/3+1/5=1/x
5/15+3/15=1/x
8/15=1/x
x=15/8
x=1.875 days working together
check
1/a+1/b=1/x
1/3+1/5=1/x
5/15+3/15=1/x
8/15=1/x
15/8=x
x=1.875 days working together
ok