A person Drove from 8am Tuesday to 5pm Wednesday. Total drive 396 miles. He have lunch for 30 min on Tuesday and sleep overnight from 7pm Tuesday and go back to drive at 5am Wednesday. On Wednesday he have 30 min for lunch. What is the average speed that he drives?

average speed = 18 miles / hour

Explanation:

Given data

drive = 396 miles

time = 8 am Tuesday to 5 pm Wednesday = 33 hours

lunch = 30 min Tuesday + 30 min Wednesday = 60 min = 1 hour

sleep = 7 pm Tuesday to 5 am Wednesday = 10 hours

to find out

average speed

solution

we know that he take total time = 33 hours and he took rest + luch = (1 + 10 hours)

so total travel time is = 33 - 11 = 22 hours

so

average speed = distance / time

average speed = 396 / 22

average speed = 18 miles / hour