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Sagot :
The average speed is 52 miles/hr, the correct option is C.
What is Speed?
Speed is the rate of traveling a certain distance in a fixed period of time.
It has units of m/sec, km/hr.
Lisa drove 80 miles
Let x hours be the time taken to cover 80 miles
Speed = 80/x
The speed is increased by 20 miles/hour
Speed new = (80/x)+20
Distance covered = 180 miles
Time = x+1 hours
Then,
180/(x+1) = (80/x) +20
By solving this the value of x is obtained
x = 2 hours
Initial Speed = 80/2 = 40 miles/hour
Final Speed = 60 miles / hour
The average speed = Total Distance / Total time = 260/5 = 52 miles/hr
Therefore, the average speed is 52 miles/hr, the correct option is C.
To know more about Speed
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