Daniel Farke’s side started strongly, asserting their dominance over the Tigers but relinquished control as the first half wore on.
United went in goalless at the break but hit the front shortly after the restart thanks to a Manor Solomon assist for Joseph on the Tottenham Hotspur loanee’s debut.
There were also first appearances for new arrivals Largie Ramazani and Ao Tanaka, who were introduced from the bench, along with Piroe who took receipt of Junior Firpo’s pinpoint cross-field ball before slotting beyong Hull goalkeeper Ivan Pandur to put the result beyond doubt.
Here are the player ratings as Leeds move up to fourth in the Championship table.
13. Ao Tanaka - N/A
A brief cameo but showed that he wants to get on the ball often. Always an option for a pass and passed it nicely. Photo: Leeds United
14. Joe Rothwell - N/A
Similar story to Tanaka. Tried a forward pass or two that didn't quite work out but didn't want to just settle for safe possession. Photo: George Wood
15. Joel Piroe - 7/10
Took his goal expertly. Touch was heavy a couple of times but he played one or two nice link-up passes. Settled into it quickly too. | Danny Lawson/PA Wire
16. Sam Byram - 7/10
Brought a measure of calm in possession when he came on for Bogle late on. Photo: Stu Forster
17. Referee: Gavin Ward - 4/10
Inconsistent. Made some strange calls for both sides. Let some things go that should have been given, simply missed others. | Getty Images