SOLUTION: Fill in the blanks to make a true statement. Gabriella drives for 40 miles at 60 miles per hour, 20 miles at 40 miles per hour, and 10 miles at 56 miles per hour. Her over

Algebra ->  Proportions -> SOLUTION: Fill in the blanks to make a true statement. Gabriella drives for 40 miles at 60 miles per hour, 20 miles at 40 miles per hour, and 10 miles at 56 miles per hour. Her over      Log On


   

Question 1210622: Fill in the blanks to make a true statement.

Gabriella drives for 40 miles at 60 miles per hour, 20 miles at 40 miles per hour, and 10 miles at 56 miles per hour. Her overall average speed is 40 miles per hour. If she drove for another __ miles at ___ miles per hour, then her overall speed would be ___ miles per hour.
Answer by josgarithmetic(39823) About Me  (Show Source):
You can put this solution on YOUR website!
SPEED          TIME(minutes)         DISTANCE
 60            40                    40
 40            30                    20
 56            10.7                  10
TOTAL          80.7 minutes          70

That on its own gives a speed done as about 70%2F%28%2880.7%2F60%29%29=52 miles per hour.
The question asked seems too open ended. Is the exercise expect to pick from the speeds already used
or the distances already used, and find the resulting speed? Is the person expected to choose a
result average speed and find combinations of some other miles and speeds to make the expected average
speed fit?