to get Kms you multiply Miles by 1.6, so 40 X 1.6 = 64
40 Mph is roughly 64 kph
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52 miles at 40 miles per hour = (52 / 40) = 1.3 hours = 1 hour 18 minutes
About 25.3 miles per hour.
9 mph for 1 hour and 40 minutes is 15 miles. 1 hour at 9 mph = 9 miles 40 minutes at 9mph = 6 miles 9 miles + 6 miles = 15 miles
There are 1.609344 kilometres in one mile. therefore, 40 miles is equal to 40 x 1.609344 = 64.37376 kilometres per hour.
It will take: 30/40 = 3/4 of an hour