REFERENCES:
- http://spmphysics.onlinetuition.com.my/2013/06/exercises-conversion-of-unit-of-speed.html
- http://lasp.colorado.edu/~bagenal/MATH/problems/problems1.html
- https://www.shmoop.com/basic-operations/scientific-notation-exercises.html
- https://www.tutorialspoint.com/units_and_dimensions/units_and_dimensions_absolute_and_relative_errors.asp
