Question
Ahmad and Mary were in a roller skating race. Ahmad was travelling at a constant speed of 18 km/h and they both did not change their speed. When Mary completed half of her race, Ahmad was 3.6 km ahead. Ahmad completed the race at 11.50 a.m. What time did Mary complete the race?
3 m

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Ahmad and Mary were in a roller skating race. Ahmad was travelling at a constant speed of 18 km/h and they both did not change their speed. When Mary completed half of her race, Ahmad was 3.6 km ahead. Ahmad completed the race at 11.50 a.m. What time did Mary complete the race?