Two pipes can fill a cistern in 72 and 90 minutes respective

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Two pipes can fill a cistern in 72 and 90 minutes respectively. If both the pipes are left open how long will it take for the cistern to be half full?

[SSC CPO 16th-March-2019-Shift-2]

A 40 minutes

B 24 minutes

C 48 minutes

D 20 minutes