Answer:

Step-by-step explanation:
Initially legal speed to move through the drive way is 55 mi/h
so it is given as

final legal speed is given as

now we know that time taken to cover the distance of 700 km is given by the formula

so initially time taken to cover that distance is


Now if legal speed is increased then the time taken to move through same distance is given as


so total time saved is given as

