Two pipes A and B can fill an empty cistern in 8 hours and 10 hours respectively. If both the pipes are simultaneously opened in an empty cistern, what part of the cistern is filled after 4 hours?

Two pipes A and B can fill an empty cistern in 8 hours and 10 hours respectively. If both the pipes are simultaneously opened in an empty cistern, what part of the cistern is filled after 4 hours?
1). 3/5
2). 9/10
3). 3/10
4). 9/12

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