Answer:
on the second day it took them 6 hours to get to their grandparents' house
Step-by-step explanation:
First we have to calculate how many miles they had to drive the second day
For this we have to subtract from the total miles the number of miles they drove the first day
843 mi - 483 mi = 360 mi
To calculate the time it takes we have to divide the distance it has to travel by the average velocity at which they travel
v = 60 mi/h
d = 360 mi
t = d/v
t = 360(mi) / 60(mi/h)
t = 6 h
on the second day it took them 6 hours to get to their grandparents' house
