Answer:
50mph
Explanation:
Speed (v) is equal to distance (d) divided by time (t)
so we have the formula
Adrian needs to be at his grandmother's house in 3 hours so
His grandmother's house is 150 miles away so
now we can plug these values into our formula and we get
So, Adrian needs to drive at 50 miles per hour to get to his grandmother's house in three hours.