A fill pipe can fill 1/6 of cistern in 90 minutes in how many minutes, it can fill 5/6 of the cistern?  Select: A) 450 min B) 360 min C) 240 min D) 306 min E) 500 min
1/6 of the cistern can fill in 90 min   5/6 of the cistern can fill in = 90*6*5/6= 
<gadget id="calculator">90*6*5/6</gadget>
<output>450</output>
450 min   450 minnswer is 450 min
<result>A</result>
A fill pipe can fill 1/6 of cistern in 90 minutes in how many minutes, it can fill 5/6 of the cistern?