How to Cheat
but first, i'll tell you how to cook it right.
as others have mentioned, 1 part rice to 1 1/2 parts water is the standard ratio, plus a little salt and maybe butter. follow the recipe on your rice package though, as different kinds of rice can vary somewhat.
bring the water to a boil, add the rice & salt, bring it back to a full boil and give it a stir to make sure none has clumped together. turn the heat down so that it's barely simmering and put the lid on. after this point, it's important NOT to STIR the rice any more. as the water level reduces, it leaves little vents that allow the water below to steam the rice above. if you stir after this point, there's no way for the water below to reach all the rice above, leaving the rice above under-cooked and the rice below mushy. ideally, the rice will be just perfectly cooked when the last of the water evaporates at the bottom.
time will give you an approximate result, but not necessarily perfect. you may want to visually check the bottom by inserting a chop stick or butter knife along the side of the pan down to the bottom and open a small vent, disturbing the rice as little as possible, to see if the water is gone. if so , let it sit with the lid on for about 5 minutes and then it's ready to fluff and serve. another way to tell if the water is gone, is to listen near the bottom of the pan for a "crackling" sound. this will start after the water is gone. if at this point, the rice is over- or undercooked, adjust the mount of water next time. it should be about right with the standard ratio, though.
it takes practice to get the usual method down, so...
ok. How to Cheat
this way of cooking is sometimes used in restaurants. approach cooking rice as though it were pasta, using perhaps 2 or 3 times the usual amount of water. check it from time to time, and when the rice is cooked al the way through, strain it well immediately, place it in a shallow baking pan , season with salt & butter and fluff, cover with aluminum foil, and leave it in a warm oven for 10 minutes or so before serving. it's also a convenient way to make pilaf by adding some shopped green onion and parsely.
hope this points you in the right direction. good luck in the future.