Posted by Yoana on Tuesday, July 17, 2012 at 11:09pm.
Use cross multiplication for direct proportions:
Given A:B, then C:X is given by
X=CB/A.
Here
75 ft : 1/13 sec.
X ft : 5 1/2 sec
we find X by:
X=75*5 1/2 ÷ 1/13
= 75*(11/2)÷(1/13)
=...
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