It depends on fraction of what.
It is 1/9 of a day, 1/63 of a week.
It takes approximately 2hrs 40mins.
2hrs 40mins to 3hrs 15mins
40mins
This is equal to 2/3
3hrs 40mins
2hrs and 9mins or 2hrs and 10mins
3h 40mins
1hr. 40mins
2 hours 40mins
London-Prague is about 1hr 40mins.
You need to maintain a pace of 6.53 mph
2hrs.