Question
Pierre and Gwen started driving at 10.39 a.m. from City P and headed towards City Q which was 324 km away. Pierre took 4 hours to complete his journey. Gwen's average speed was 9 km/h faster than Pierre's. At what time did Gwen arrive at City Q?
3 m

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Pierre and Gwen started driving at 10.39 a.m. from City P and headed towards City Q which was 324 km away. Pierre took 4 hours to complete his journey. Gwen's average speed was 9 km/h faster than Pierre's. At what time did Gwen arrive at City Q?