Miriam left Chicago at 9:00 AM and headed to Washington. The first 2 hour Miriam averaged 70 mph. But after she decided to reach
Washington at 6:00 PM, she increased her speed. What was her speed after increasing, if the distance between the cities is 700 miles.
2 answers:
Answer:
80 mph
Step-by-step explanation:
step 1
Find the distance traveled by Miriam the first two hours
Remember that the distance is equal to the speed multiplied by the time
we have
![speed=40\ mph\\time =2\ h](https://tex.z-dn.net/?f=speed%3D40%5C%20mph%5C%5Ctime%20%3D2%5C%20h)
![70(2)=140\ miles](https://tex.z-dn.net/?f=70%282%29%3D140%5C%20miles)
so
9:00 AM +2 h=11:00 AM
At 11:00 am Miriam has travel 140 miles
step 2
Find out the speed
Remember that the speed is equal to divide the distance by the time
The time is equal to
6:00 PM-11:00 AM=7 h
the distance is equal to
700-140=560 miles
therefore
![560/7=80\ mph](https://tex.z-dn.net/?f=560%2F7%3D80%5C%20mph)
Answer:
80 mph
Step-by-step explanation:
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