Question
David and Betty were in a roller skating race. David was travelling at a constant speed of 17 km/h and they both did not change their speed. When Betty completed half of her race, David was 3.4 km ahead. David completed the race at 9.15 a.m. What time did Betty complete the race?
3 m

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David and Betty were in a roller skating race. David was travelling at a constant speed of 17 km/h and they both did not change their speed. When Betty completed half of her race, David was 3.4 km ahead. David completed the race at 9.15 a.m. What time did Betty complete the race?