Question 1134494
A faucet can fill a tub in 12 mins.
 The leaky drain can empty the tube in. 30 mins.
 If the faucet is on and the drain is leaking, how long would it take to fill the tub?
:
let t = time to fill the tub in these conditions
let the full tub = 1
:
A typical mixture problem
{{{t/12}}} - {{{t/30}}} = 1
multiply equation by 60
60*{{{t/12}}} - 60* {{{t/30}}} = 60(1)
cancel the denominators
5t - 2t = 60
3t = 60
t = 60/3
t = 20 min to fill the tub