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  • Mabel passed by her father at 8:30am (915am minus 45 minutes)
  • Distance traveled by Father from 8:30am to 9:15am: 68km/h * (45min / 60min) = 51km
  • Distance covered by Father in 45 minutes plus 3km is equivalent to the distance Mabel traveled in 30mins from 8:00am to 8:30am: 51km + 3km = 54km
  • Therefore, Mabel’s speed is 54km * (60min / 30min) = 108km/h
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