# College Physics 2.10 – The tidal friction

## Solution:

$\displaystyle \Delta \text{t}=\frac{3.84\times 10^6\:\text{m}}{4\:\text{cm/year}}\times \frac{100\:\text{cm}}{1\:\text{m}}=96\:000\:000\:\text{years}$

$\displaystyle \Delta \text{t}=9.60\times 10^7\:\text{years}$

It will take about 96 million years.