A boy runs 1.5 km in 45 minutes. What is his speed in kilometers per hour?
Since 1 hour is equal to 60 minutes, then 45 minutes is equal to 45/60 = <<45/60=0.75>>0.75 hours.
Then, the speed in kilometers per hour is 1.5 km/0.75 hour = 2 kilometers per hour.
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