The time between a lightning flash and the following thunderclap may be used to estimate, in kilometers, how far away a storm is. How far away is a storm if 6 seconds elapse between the lightning and the thunderclap?
Use the formula d equals Start Fraction t over 3 End Fraction, where t is the time, in seconds, between the flash and the thunderclap.
A. 18 kilometers
B. 2 kilometers
C. 3 kilometers
D. 9 kilometers