An inlet pipe can fill the tank in 30 minutes. B an outlet pipe can empty the tank in 45 minutes. In what time the tank be filled if both pipes work simultaneously? Choose the most appropriate option
A) 90 minutes B) 80 minutes C) 70 minutes D) 60 minutes E) 50 minutes
Time taken to fill the tank= LCM = 90   = Ratio= 30:45=2:3   = 90/(3 - 2)= 
<gadget id="calculator">90/(3 - 2)</gadget>
<output>90</output>
90/1= 
<gadget id="calculator">90/1</gadget>
<output>90</output>
90 minutes   90 minutesNSWER:90 minutes
<result>A</result>
An inlet pipe can fill the tank in 30 minutes. B an outlet pipe can empty the tank in 45 minutes. In what time the tank be filled if both pipes work simultaneously?