A Cyclist drove one kilometre, with t...

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? `2 1/3m in` b. `2 3/7m in` c. `3 3/7m in` d. `3 7/(12)m in`

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