Question
David and Barbara started driving at 11.40 a.m. from City Y and headed towards City Z which was 324 km away. David took 4 hours to complete his journey. Barbara's average speed was 9 km/h faster than David's. At what time did Barbara arrive at City Z?
3 m

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David and Barbara started driving at 11.40 a.m. from City Y and headed towards City Z which was 324 km away. David took 4 hours to complete his journey. Barbara's average speed was 9 km/h faster than David's. At what time did Barbara arrive at City Z?