Two cars move with constant velocities. At t = 0, a blue car is at xBo= 20 m. After t = 4 s in the blue car time frame of reference, a red car located then at xRo= 0 m , within 3 seconds catches up with the blue car at xB = xR = 60 m.   Find the velocities of blue and red cars

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Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.