Question
Fred and Diana started driving at 11.43 a.m. from City R and headed towards City S which was 280 km away. Fred took 4 hours to complete his journey. Diana's average speed was 10 km/h faster than Fred's. At what time did Diana arrive at City S?
3 m

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Fred and Diana started driving at 11.43 a.m. from City R and headed towards City S which was 280 km away. Fred took 4 hours to complete his journey. Diana's average speed was 10 km/h faster than Fred's. At what time did Diana arrive at City S?