Posted by Derrick on Saturday, March 24, 2012 at 11:07am.
Which is the closest to the speed of sound in air?
A. 7miles per hour
B. 70miles per hour
C. 700miles per hour
D. 7000miles per hour
C?

Science  PsyDAG, Saturday, March 24, 2012 at 12:02pm
I would agree with C.
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