You must drive at 521/7 mph.
You must average at least 81.5 miles per hour for 815 miles.
65.6
56.7 miles per hour. This is gotten by dividing distance by time (units for speed are distance/time)
You must drive at a speed of (16.9 miles) per (15 minutes), or 67.6 mph.
To do 56 miles in 3 hours and 30 minutes you must travel 16 miles per hour.
If the first 120 miles takes 3 hours, then the remaining 350 (470 - 120) miles has to be completed in 5 (8 - 3) hours. Velocity = Distance ÷ Time : Velocity = 350 ÷ 5 = 70 mph The speed over the final 350 miles is therefore 70mph.
You must average at least 17.5 mph for 175 miles.
Six more hours.
In order to work this problem, you must know how fast you will be driving. Let's assume you will be driving an average of 55 miles per hour (that is, 55 mph). This means in one hour you will drive 55 miles. (1 hour/55 miles) x (212 miles) = 3.85 hours If you will be driving faster or slower than 55 mph,then change the 55 in the problem above and redo the multiplication to see what your time will be.
You must maintain a pace of at least 6.55 miles per hour for 13.1 miles.
1.5 miles / 749 seconds = 3600 x 1.5 miles / 749 hours = 7.21 miles per hour
100