SOLUTION: Suppose you are entered in a driving contest and you are to maintain an average speed of 60 mph for 2 miles. Your engine develops a miss and you can only maintain 30 mph for the fi
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Question 312521: Suppose you are entered in a driving contest and you are to maintain an average speed of 60 mph for 2 miles. Your engine develops a miss and you can only maintain 30 mph for the first mile. The miss disappears after the first mile and the engine returns to normal. How fast must you drive the second mile to meet the overall average speed requirement? Answer by checkley77(12844) (Show Source):
You can put this solution on YOUR website! 60*2=120 MILES IS THE DISTANCE.
D=RT
120=30*1+X*1
120=30+X
X=120-30
X=90 MPH IS THE SPEED FOR THE SECOND MILE.
120=[(30+90)/2]2
120=[120/2]2
120=60*2
120=120
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