Question

The Johnson family is going on a family trip to New York,270 miles away.They drive for 3 hours, then stop for lunch, then drive for another 1 1/2 hours before arriving. What is their average speed?

Answer 1

60 mph

Explanation:

Their average speed while driving is ...

speed = distance / time

= (270 mi)/((3 + 1.5) h) = 60 mi/h

The Johnson family averaged 60 mph while driving.

__

Their average speed for the trip is unknown, because we don't know how long the lunch stop was.