Tom drives a truck. his regular trip is a distance of 280 km. he drives at an average speed of 80 km/h. how much longer will it take tom to drive his regular trip?

It asks how much longer will it take Tom to drive his regular trip, but nothing else is stated expect the distance and average speed... so I'm gonna with that! :D

Time = Distance/Speed
Time = 280 km / 80 km/h (divide 280/80, cancel out km)
Time = 3.5 hours

It will take Tom 3.5 hours to drive his regular trip.