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If you are a genius then solve the mathematical problem?

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Published: 10 Oct 2018 › Updated: 10 Oct 2018If you are a genius then solve the mathematical problem?

If you are a genius then solve the mathematical problem?

if a boat goes 7km upstream in42 minutes and the speed of the stream is 3 kmph,then the speed of the boat in still water is???42393298_2225699697492339_4075961042356666368_n.jpg

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