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Since both did not change their speed throughout the race, it means the distance between them is constant until the end.

Distance  = 15km

Speed = 90

Time difference between them = 15/90 = 1/6 hour = 10 minutes

Hence Charles would reach the finishing line at 9:45am.

 

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Thank you sushi88 and god bless you. 🙏

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Welcome! 🙂

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