Question
Risa and Ethan started biking at 7.50 a.m. along 8-km trail. Risa took 30 minutes to reach the finishing point. Ethan’s speed was 10 km/h slower than Risa’s. At what time did Ethan reach the finishing point?
3 m

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Risa and Ethan started biking at 7.50 a.m. along 8-km trail. Risa took 30 minutes to reach the finishing point. Ethan’s speed was 10 km/h slower than Risa’s. At what time did Ethan reach the finishing point?