SOLUTION: a motorcycle drives 240 miles in 4 hours. she kept a steady speed for the first 3 hours of the trip, then she drove 20 mph slower. what were her two speeds and what is the average

Algebra.Com
Question 885251: a motorcycle drives 240 miles in 4 hours. she kept a steady speed for the first 3 hours of the trip, then she drove 20 mph slower. what were her two speeds and what is the average speed?
Found 2 solutions by nfickas15, MathTherapy:
Answer by nfickas15(2)   (Show Source): You can put this solution on YOUR website!
To solve this problem we will use the distance formula D = r*t.
In the problem it says that the motorcycle drives 240 miles. That is the distance. It also says it drives for four hours, but this problem has two different rates. For the first 3 hours it drives a constant speed. For the last hour it drives 20 mph slower.
Therefore,

I found this by simply plugging in the numbers to the distance formula.
When we solve for x we get.



For the first 3 hours she drove 65 mph. For the last hour she drove at 45 mph. To find the average speed we add those two numbers together and then divide by 2.

Which is equal to 55 mph.
Answer by MathTherapy(10549)   (Show Source): You can put this solution on YOUR website!

a motorcycle drives 240 miles in 4 hours. she kept a steady speed for the first 3 hours of the trip, then she drove 20 mph slower. what were her two speeds and what is the average speed?


Faster speed:            mph

Slower speed:            mph

Average speed: , or  mph 

RELATED QUESTIONS


Maria drove a total of 
301.5
 miles in two legs of a trip. In the first part of her... (answered by greenestamps)

Susan drove for 4 hours on secondary roads at a steady speed. She completed her trip by... (answered by josgarithmetic)

On a road trip Maura drove at a speed of 60 miles per hour for the first 2 hours she then  (answered by josmiceli)

In one day Pauline Shannon drove front royal Virginia to Asheville ,North... (answered by Edwin McCravy)

Samantha drove a total of 641.5
 miles in two legs of a trip. In the first part of her... (answered by ikleyn)

Teri drove an average of 52 miles per hour on a 5-hour trip. During the first 3 hours,... (answered by stanbon)

Mandy drove slowly for 3 hours in a rain storm. When the skies cleared she increased  her  (answered by solver91311)

mandy drove slowly for 3 hours in a rain storm. when the skies cleared, she increased ber  (answered by ewatrrr)

Amanda drove 63 miles at a constant speed for 1.5 hours. If she drives at the same speed,  (answered by tommyt3rd)