2 over 11 x 3 and 7 over 15
I think that this is the meaning Tetration :)
$$\\\frac{2}{11}\times 3\frac{7}{15}\\\\ =\frac{2}{11}\times \frac{3*15+7}{15}\\\\ =\frac{2}{11}\times \frac{52}{15}\\\\ =\frac{104}{165}\\\\$$
Please rephrase the question to make it easier to understand?