Reply To: Puzzles

>and v = 1/(sqrt(101)-10) approximately 20.499 mph.

I see I made an error in evaluating the numerical value of the velocity. I should have said 20.0499 mph.

If you, like me, are required to carry out numerous arithmetic calculations, I can recommend Thomas de Colmar’s Arithmometer, as exhibited at The Great Exhibition of 1851. I have found it of great benefit in reducing errors in basic arithmetic calculation. I should make better use of it.