Question 909811
rate for A alone 8
rate for A & B together 3
1/a+1/b=1/x
1/8+1/b=1/3
1/b=1/3-1/8
1/b=8/24-3/24
1/b=5/24
1/b=1/4.8
b=4.8
rate for B alone 4.8
check
1/8+1/4.8=1/3
4.8/38.4+8/38.4=1/3
12.8/38.4=1/3
ok
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