Given:
it is given that average speed of driving is 39 miles per hour.
Find:
we have to find the distance travelled in 8 hours 15 minutes , if average speed is 39mph.
Step-by-step explanation:
we know 1 hour = 60 minutes
The average speed is = 39miles per hour = 39/60 miles per minutes
we know, Distance = Speed * Time
Therefore, the distance travelled in 8 hours 15 minutes is
Distance = (8 * 39) + (15 *(39/90)) = 312 + 6.5 = 318.5 miles
Therefore, Distance travelled in 8 hours 15 minutes is 319 miles(by rounded to nearest miles)