Please answer this question correctly

In which source of water would a wave travel the fastest? o ice o cold o room temperature o hot mark this and return save and exit next

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

One side of a rectangle is 7 feet shorter than seven times the other side. find the length of the shorter side if we also know that the perimeter of the rectangle is 306 feet.