At 7:30 AM in the morning, Ukrainian army tank is 50 km due west of a Russian army tank. The Ukrainian army tank is then moving due north at 15 km/h, and Russian army tank is moving due west at a rate of 20 km/h. If these two tanks continue on their respective courses: (a) at what time will they be nearest one another? (Use the time format: HOUR:MINUTES AM/PM) (b) what's the nearest distance, in km, between the two tanks?

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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.