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

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