Question
Opal and David started biking at 9.45 a.m. along 9-km trail. Opal took 30 minutes to reach the finishing point. David’s speed was 12 km/h slower than Opal’s. At what time did David reach the finishing point?
3 m

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Opal and David started biking at 9.45 a.m. along 9-km trail. Opal took 30 minutes to reach the finishing point. David’s speed was 12 km/h slower than Opal’s. At what time did David reach the finishing point?