Speed Time Distance Calculator

doesent calculate time

I like the simplicity of this extension, however it would be highly useful to have dual speed options (mph and kmh)and it seems that the finding distance option doesn't work, though I would primarily use the app for calculating time with an already known distance and speed for TSD road rallies and probably wouldn't use the function. It did not do that as well either as 1 km at 60km/h came up as 59 seconds so there is a small error.