A car travels from Los Angeles to San Diego, a distance of 120 miles in 1 hour and 45 minutes. What was the car's average speed?

68.57 miles per hour

Explanation:

Given data

Distance= 120 miles

Time= 1 hours 45 minutes

Let us convert the time all to hours

45 minutes to hours is 0.75 hours

Hence the time in hours is

=1+0.75

=1.75 hours

Also, the expression for the speed is given as

Speed= distance/time

Substitute

Speed= 120/1.75

Speed= 68.57

Hence the speed is 68.57 miles per hour

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

i think the answer is a and b

i wish you luck