There is a saying that if you remember the '70s you were not there and one of the many things I don't remember is math. Since my computer doesn't average speed does anybody have a formula that lets me enter milage and time to get an average or does anyone know where I can find a chart.

For example, Tuesday we did 20 miles in 1hr, 36 minutes and today we did the same 20 miles in 1hr and 15 minutes. How does an aged brain do the math?

LastPlace