7:45
8:15 to 9:00 = 0:45
9:00 to 12:00 = 3:00
12:00 to 4:00 = 4:00
Total: 7 hours 45 minutes
Unless it is say 8:15am to 4:00am next day.,
then add 12 hours = 19:45
400 kph = 248.55 mph
Answer: 400 km/h = 248.548 mph
You must average at least 81.5 miles per hour for 815 miles.
14 400
Answer: 815 yd = 0.745236 km
815 pounds = 13,040 ounces
Answer: 815 km = 506.417 mi.
815 grams = 28.75 ounces.
Per hour the answer is 400 watt-hours or 0.4 kW-hours (or units).
There are 1000 metres in one kilometre. Therefore, 815 metres is equal to 815/1000 = 0.815 kilometres.
60 minutes = 1 hour so 400 min = 400/60 = 6.66... hours. Simple!
400 km per hour is 248.55 miles per hour.