Question 892449
1/40+1/k=1/15
k = 24
Kayla, working alone, can do it in 24 minutes.
check

1/40+1/24=1/15
1/8*5+1/8*3=1/3*5
3/3*8*5+5/5*8*3=8/8*3*5
8/8*3*5=8/8*3*5
8/120=8/120