Assuming that is a constant speed it would take 6.8 hours or 6 hours and 48 minutes.
9.71428571 hours. That's 9 and 5/7 hours.
It is 680 miles and 13.5 driving hours according to Google Maps.
10 hours 27 minutes. This is the actual driving time at that speed and does not include stops or delays.
17 hours.
Approx 423 miles.
Answer: 680 yd = 0.386363 miles.
8.5 hours.
9hrs, 42mins, 51sec
Solve like this: 800/680=x/100 so x=800(100)/680 = 20(100)/17 = 117.647(05882...)% Round as you see fit.
680 km = 422.5
15% off of 680 = 85% of 680 = 680*85/100 = 578
(170/680)*100=25 hence 170 is 25% of 680