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how far will a cyclist travel in 15 mins if he cycles at 18 km per hour?
Since the speed is given in km/hour
we must convert 15 mins to hours:
15 * 1/60 = .25 hours
And, from the "distance formula":
d = rt
d is distance
r is rate or speed
t is time
d = 18*.25 = 4.5 km (distance traveled)