A fill pipe can fill 1/2 of cistern in 15 minutes. In how many minutes, it can fill 1/2 of the cistern? Choose the most appropriate option:  A) 1 min  B) 5 min  C) 10 min  D) 15 min  E) 20 min
Required time = 15*2*1/2= 
<gadget id="calculator">15*2*1/2</gadget>
<output>15</output>
15 minutes   Answer is 15 min
<result>D</result>
A fill pipe can fill 1/2 of cistern in 15 minutes. In how many minutes, it can fill 1/2 of the cistern?