Question
Rachel and Billy started biking at 8.50 a.m. along 9-km trail. Rachel took 30 minutes to reach the finishing point. Billy’s speed was 12 km/h slower than Rachel’s. At what time did Billy reach the finishing point?
3 m

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Rachel and Billy started biking at 8.50 a.m. along 9-km trail. Rachel took 30 minutes to reach the finishing point. Billy’s speed was 12 km/h slower than Rachel’s. At what time did Billy reach the finishing point?