Question
Shiyun and Sean started biking at 6.50 a.m. along 9-km trail. Shiyun took 30 minutes to reach the finishing point. Sean’s speed was 12 km/h slower than Shiyun’s. At what time did Sean reach the finishing point?
3 m

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Shiyun and Sean started biking at 6.50 a.m. along 9-km trail. Shiyun took 30 minutes to reach the finishing point. Sean’s speed was 12 km/h slower than Shiyun’s. At what time did Sean reach the finishing point?