Distance = Speed x ____.
A girl goes to her friend's house, which is at a distance of 12 km. She covers half of the distance at a speed of x km/hr and the remaining distance at a speed of (x + 2) km/hr. If she takes 2 hrs 30 minutes to cover the whole distance, find `x`.
A block of mass m moving at a speed v compresses a spring through a distance x before its speed is speed is halved. Find the spring constant of the spring.