Answer: 782.05 miles.
Explanation: Percentage is a ratio expressed as fraction of 100, in other words, 61% is represented as
or 0.61.
London slept 61% of the journey, so it means he was awake for 39% of the journey. Now the total trip is
or 1, so the relationship will be
0.39 ---- 305 miles
1 ----- x

x = 782.05
The total length of the trip was 782.05 miles.