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20-02-2024
Physics

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A boat goes downstream through a certain distance in 1 hour and returns back in 1.5 hours. If the current is flowing at the speed of 3 km/hr, what is the speed of the boat in still water?

a. 7.5 km/hr
b. 9 km/hr
c. 10.5 km/hr
d. 12 km/hr

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