Question 912070
1/a+1/b=1/x
1/4+1/6=1/x
6/24+4/24=1/x
10/24=1/x
x=24/10
x=2.4 days working together
check
x/a+x/b=1
x/4+x/6=1
2.4/4+2.4/6=1
0.6+0.4=1
1.0=1
ok
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