how long will it take to fill the sink?

a cold water faucet could fill a sink in 15 minutes and a hot water faucet can fill it in 12 minutes the drain can empty the sink in 25 minuetes if both faucets are on and the drain is open how long will it take to fill the sink
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1 Answer

rate1=4/our

rate2=5/our

rate3=-60/25=-2.4/our

kombined rate=9-2.4=6.6/our

time=1/6.6=0.15151515151515151515...our

=9 minuts
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