Question
Sean and Bobby started running a 10-km cross-country race together at a speed of 6 km/h and 12 km/h respectively. At the halfway mark, Bobby took a rest until Sean caught up with him. How long did Bobby rest? Express your answer in min.
3 m

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Sean and Bobby started running a 10-km cross-country race together at a speed of 6 km/h and 12 km/h respectively. At the halfway mark, Bobby took a rest until Sean caught up with him. How long did Bobby rest? Express your answer in min.