Part A Two piers, A and B, are located on a river: B is 1500 m downstream from A (Figure 1). Two friends must make round trips from pier A to pier B and return. One rows a boat at a constant speed of 4.00 km/h relative to the water; the other walks on the shore at a constant speed of 4.00 km/h. The velocity of the river is 2.80 km/h in the direction from A to B. How much time does it take the walker to make the round trip? Express your answer using two significant figures. nνα ΑΣφ ? t = min Submit Request Answer Part B How much time does it take the rower to make the round trip? Express your answer using two significant figures. Figure < 1 of 1 > ? t = min Submit Request Answer 1500 m Provide Feedback V'cumrent

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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.