Integrating to Find Distance from Velocity

An ant is trying to carry a grain to its nest. It starts at 10 feet away from the nest, and walks in a straight line towards the nest. Furthermore, its velocity is characterized by $v=10-0.5x$, in feet per second, where $x$ is the ant's distance away (in feet) from the starting position. Rounding up to the nearest tenth, how many seconds it takes for the ant to get to its nest?