18 mph = 28.9km/h
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18 x 5 / 8 = 11.25mph
150/8 or between 18½ and 19 mph
18 miles on the bicycle, 60 miles on the motorboat.
60/18 minutes ie 3m 20s
if your driving 60 miles per hour then its would take about 1 hour and 18 minutes.