what is the velocity of a car on I-80 starting the trip at 2.3 miles and ending at 77 miles starting 5 minutes getting on the expressway, ending at 45 minutes?

                                            Distance = (speed) x (time)

Divide each side by (speed):     Time = (distance) / (speed) =

                                                                 (3 km) / (1.5 km/hr)  = 2 hours

If the driver is in a hurry and can't wait 2 hours to get to the bottom,
he should get out and walk.  Average adult walking speed is a bit
more than 3 times as fast as 1.5 km/hr.