Please help A rock is thrown horizontally from a cliff at 40 m/s. If the rock lands 155 meters from the base of the cliff. How long was the rock in the air?

As seen in a us weather map, the h (or high) and l (or low) symbols indicate regions where surface air pressures are high or low, respectively, compared to surrounding areas. an h is plotted where the air pressure is highest and an l is plotted where the air pressure is lowest. proceeding outward and away from the center of a high pressure system, the air pressure "