Paul hikes 24 km.   For the first 4 km, he has traveled at a rate of 2 km/hr.

How fast must he hike the remainder of the distance to average 4 km/hr for the entire journey?

Solution to the Problem:

          He must hike 5 km/hr.

Set up a table where Rate x Time = Distance.

    RATE         TIME         DISTANCE    
    2 km/hr         2 hr         4 km    
    x = 5 km/hr         4 hr         20 km    
    4 km/hr         6 hr         24 km    

Correctly solved by:

1. James Alarie Flint, Michigan
2. David & Judy Dixon Bennettsville, South Carolina