Question 931578
x the time it takes the cold water faucet working alone to fill the tub
Per min KEY
{{{1/30 + 1/x = 1/18}}}  |Multiplying thru by 540x so as all denominators = 1
18x + 30(18) = 30x
540 = 12x
45min = x, the time it takes the cold water faucet working alone to fill the tub