Boat A travels downstream from Point X to Point Y in 3 hours less than the time taken by Boat B travel upstream from Point Y to Point Z. The distance between X and Y is 20 km, which is half of the distance between Y and Z. The speed of Boat B in still water is 10 km/h and the speed of Boat A in still water is equal to the speed of Boat B upstream What is the speed of Boat A in Still water? (Consider the speed of the current to be the same.) a.
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