A man drives a truck 96 km in 3 hours, then stops to refuel and eat lunch at a gasoline station for an hour. He then drives the truck for another 4 hours, covering 144 km.
What was the truck’s average speed throughout the whole journey (in kilometers per hour)?
avg speed = totaldistance/totaltime. So,
(96+144)km / (3+1+4)hr = ? km/hr