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Question
A cyclist drove one kilometre, with the wind in his back, in 3 minutes and drove the same way back, against the wind, in 4 minutes. If we assume that the cyclist always puts constant force on the pedals, how much time would it take him to drive 1 km without wind ?
Options:
A .  $$2\frac{1}{3}$$ min
B .  $$2\frac{3}{7}$$ min
C .  $$3\frac{3}{7}$$ min
D .  $$3\frac{7}{12}$$ min
Answer: Option C

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