Cristina recently got her driver’s license and her dad is concerned she is not being careful enough as a new driver. The used car he purchased measures her speed in kilometers per hour (kph) and he has told her that if she drives over 100 kph, he will take away her car keys for 30 days.

At the start of summer vacation, Cristina drove from her home in Fairfax to her grandmother’s house in Richmond, a drive of exactly 100 miles. She left at 10:30 a.m. and her dad told her to take a 20 minute break for lunch along the way and then call immediately upon reaching her destination.

Assuming she followed his directions and using the conversion of 1 mile = 1.61 kilometers, what is the earliest she could call from grandma’s house and not be in trouble for driving too fast? If she takes a 45 minute lunch break instead of 20 minutes, how fast can she drive, on average, and still arrive at the same time? Express your answers in mph.

Do you think this method of monitoring Cristina’s driving is effective? Why or why not? Explain. Please respond in essay format and include details