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speed = distance / time = 80 km / 0.75 hr = 80 km / ¾ hr = 80 × 4/3 km/h = 106 2/3 km/h ≈ 107 km/h
720 km / 9 hr = 80 km / hr.
Time = Distance/Speed = 30/80 = 0.375 hours = 22.5 minutes.
It will take 47 minutes and 15 seconds to drive that distance.
Yes. 80 km = 80 * 1000m = 80 000 m