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Two pipes can fill a cistern in 72 and 9...

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?
दो पाइप किसी टंकी को क्रमशः 72 और 90 मिनट में भर सकते हैं | यदि दोनों पाइप चालू कर दिए जाए, तो टंकी को आधा भरने में कितना समय लगेगा ?

A

40 minutes

B

24 minutes

C

48 minutes

D

20 minutes

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