The pair - signed in January from West Brom and Everton, respectively - combined for the Tigers' opener on 12 minutes, Long converting after racking onto Jelavic's flick-on, only for Paulinho's second-half effort to snatch a draw for Spurs.
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Hull's top scorer this season remains Robbie Brady, who scored three goals in the opening six games of the season, but former Sunderland boss Bruce believes that he may have struck gold with his new strike partnership.
"I thought Long and Jelavic were a handful all afternoon," he told reporters.
"I am convinced they will give us the platform which we will need to make sure we stay in this division.
"They are both good players who have been round the block a little bit and know what it's all about.
"Although the partnership is only in its early days, I think they will certainly be a threat for anyone who plays against them."