A) \[\frac{{{d}_{1}}{{d}_{2}}}{{{t}_{1}}{{t}_{2}}}\]
B) \[\frac{{{d}_{1}}{{d}_{2}}}{{{t}_{2}}{{t}_{1}}}\]
C) \[\frac{{{d}_{1}}{{d}_{1}}}{{{t}_{2}}{{t}_{2}}}\]
D) \[\frac{{{t}_{1}}}{{{t}_{2}}}\]
Correct Answer: C
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