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A motorboat whose speed in still water is 18 km/h, takes 1 hour more to go 24 km upstream than to return downstream to the same spot. Find the speed of the stream.
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motorboat whose speed in still water is 18 km/h, takes 1 hour more to go 24 km upstream than to return downstream to the same spot. Find the speed of the stream.
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Traditionally, only those materials that exhibit ferromagnetic or ferrimagnetic properties are called “magnetic.” Only nine elements are ferromagnets. All are metals, of which three (Fe, Co, Ni) are iron-group metals and the other six (Gd, Tb, Dy, Ho, Er, Tm) are rare-earth metals.
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