Substitute to find the value of the expression.Traveling at r kilometers per hour for t hours, a driver will travel rt kilometers. How far will Danny travel in 13 hours at a speed of 55 kilometers per hour?
A. 4.2 km
B. 715 mi
C. 68 km
D. 715 km
Answer: D
Mathematics
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A. 4
B. 
C. 
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