Answer:
b) 60 is the distance in miles that must be travelled to get to Michael's grandparents' house
Explanation:
hello
at the speed of x mph in 1 hour he travels x miles
so in 60/x hour he travels 60 miles
so 60 is the distance in miles that must be travelled to get to Michael's grandparents' house
another way to see it is as below
distance = vitesse * time so
time = distance / vitesse
hope this helps