Easy pace, speed and time conversions for runners and cyclists.

What’s your min/mi pace in min/km?
What’s that in miles per hour?
What’s your marathon time based on that pace?
For a marathon finish time of x what pace should I run?

How long will it take to me ride an 80 km course if I average 28 km/h?

Easy conversion between all these - at the same time.
Add all the units you’re interested in. Provide input in any one.