Question

At an average speed of 10 m/s, how many kilometers can a cyclist travel in a 6 hour day?

Answer 1

You are really asking how many seconds in 6 hours:
6 h (60 min / h) ( 60 s / min) = 6 * 3600 seconds
so
6 * 3600 s * 10 m/s = 6 * 36,000 meters = 6*36 km
Heavens to Betsy! Time for a rest stop.

Answer 2

(10 m/s) * (6 hr) * (3600 s/hr) / (1000 m/km)