thats about 32 feet. i think you can run hdmi for up to 50 feet (15-16m) before you need to get a signal booster.
as for wireless signals, many wireless keyboards and mice are meant to work at relatively short distances like 2-5 feet. you can sometimes push such devices to work at 10 feet (.6-1.5m, 3m). some high quality keyboards such as the old logitech one i had which came in the mx1000 set have even further maximum ranges. i managed to push out about 40 feet from that through walls (12.5m) but with intermittant signal (it worked sometimes, didnt work others). i never tried testing a mouses maximum range.
you could "try" using extender cables from your pc to your tv area and plug your kb+m receiver in to those extender cables (and move it back and forth) but i'm not sure if it will work or not as the distance is pretty large.
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since you don't want to move anything back and forth what you could try is this...
have a KVM switch connected to your computer.
have a wireless mouse/keyboard receiver connected to this as "A"
have two cables going to your tv area connected to this as "B"
connect those extension cables to a second wireless mouse/keyboard receiver. note: they do make KVM Signal boosters if you need them.
to switch between the two all you'd have to do is flip the switch on the KVM switch from A to B or B to A. note: since its a pretty long distance there might be some delay between when you move the mouse/type on the keyboard and when it appears on screen but i cannot say for sure as i've never tested in your exact situation.