For any interval $\mathcal{A}$ in the real number line not containing zero, define its [i]reciprocal[/i] to be the set of numbers of the form $\frac 1x$ where $x$ is an element in $\mathcal{A}$.  Compute the number of ordered pairs of positive integers $(m,n)$ with $m< n$ such that the length of the interval $[m,n]$ is $10^{10}$ times the length of its reciprocal.

[i]Proposed by David Altizio[/i]
1. **Define the problem mathematically:**
   We are given an interval \([m, n]\) on the real number line, where \(m\) and \(n\) are positive integers with \(m < n\). The length of this interval is \(n - m\). The reciprocal of this interval is the set of numbers \(\left\{\frac{1}{x} \mid x \in [m, n]\right\}\). The length of the reciprocal interval is \(\frac{1}{m} - \frac{1}{n}\).

2. **Set up the equation:**
   According to the problem, the length of the interval \([m, n]\) is \(10^{10}\) times the length of its reciprocal. Therefore, we have:
   \[
   n - m = 10^{10} \left(\frac{1}{m} - \frac{1}{n}\right)
   \]

3. **Simplify the equation:**
   Simplify the right-hand side:
   \[
   \frac{1}{m} - \frac{1}{n} = \frac{n - m}{mn}
   \]
   Substituting this into the equation, we get:
   \[
   n - m = 10^{10} \left(\frac{n - m}{mn}\right)
   \]
   Simplify further by multiplying both sides by \(mn\):
   \[
   (n - m)mn = 10^{10}(n - m)
   \]
   Since \(n \neq m\), we can divide both sides by \(n - m\):
   \[
   mn = 10^{10}
   \]

4. **Find the number of solutions:**
   We need to find the number of ordered pairs \((m, n)\) such that \(mn = 10^{10}\) and \(m < n\). First, factorize \(10^{10}\):
   \[
   10^{10} = 2^{10} \cdot 5^{10}
   \]
   The number of factors of \(10^{10}\) is given by \((10 + 1)(10 + 1) = 121\).

5. **Count the pairs \((m, n)\):**
   Each factor \(d\) of \(10^{10}\) corresponds to a pair \((d, \frac{10^{10}}{d})\). Since \(m < n\), we need to count only the pairs where \(d < \frac{10^{10}}{d}\). This happens for exactly half of the factors (excluding the square root if it is an integer, but in this case, it is not). Therefore, the number of such pairs is:
   \[
   \frac{121 - 1}{2} = 60
   \]

The final answer is \(\boxed{60}\)