Yes, it is correct.
The time it takes to evaporate half a cup of salt water depends on various factors such as temperature, humidity, air circulation, and surface area. On average, it could take several hours to a day for half a cup of salt water to fully evaporate.
This is not true.
If you mean, when will the entire cup evaporate, you are supposed to divide 1 by 1/3.
I don't know where you are. - You may well be in a climate where it will never evaporate. Or you could be in central Sahara where it will evaporate in about 8hrs.
Indoor the temperature is higher.
This depends on many factors.
Heating favors the evaporation.
The answer is impossible; many factors affect this evaporation.
It is unlikely for a cup of water to completely evaporate in just a few hours unless the conditions are extreme, such as very high temperatures or low humidity. However, some water might evaporate over time depending on the environment it's in.
It could take between one and four months for a cup of water to evaporate indoors at 65 degrees depending on the surface area and the humidity.
you leave a cup of water out and leave it out for a few hours when you come it should evaporate
When left in the sun, the water in a cup will gradually heat up and may reach a higher temperature than its surroundings. Some of the water will evaporate, turning into water vapor and escaping into the air.