A, B two inlet pipes takes 15,18 minutes to fill the tank and C an oulet pipe takes 45 minutes to empty the tank respectively. In what time the tank be filled if all of them are operated together?  Choose the correct option:
A) 11 minutes B) 10 minutes C) 12 minutes D) 13 minutes E) 14 minutes
LCM=90   No of days= [90/(90/15 + 90/18 - 90/45)   = [90/(6+5-2)]   = [90/9= 
<gadget id="calculator">90/9</gadget>
<output>10</output>
10 minutes   ANSWER:10 minutes
<result>B</result>
A, B two inlet pipes takes 15,18 minutes to fill the tank and C an oulet pipe takes 45 minutes to empty the tank respectively. In what time the tank be filled if all of them are operated together?