Question
Anna and Carl started biking at 8.40 a.m. along 9-km trail. Anna took 30 minutes to reach the finishing point. Carl’s speed was 12 km/h slower than Anna’s. At what time did Carl reach the finishing point?
3 m

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Anna and Carl started biking at 8.40 a.m. along 9-km trail. Anna took 30 minutes to reach the finishing point. Carl’s speed was 12 km/h slower than Anna’s. At what time did Carl reach the finishing point?