![ryliekarenbowers](/avatars/328.jpg)
ryliekarenbowers
03.12.2021 •
Mathematics
Can someone please help me understand how to answer for x, y? Thank you so much!
Solved
Show answers
More tips
- G Goods and services How to Choose a Humidifier? Helpful Tips and Recommendations...
- W Work and Career What is the Most In-Demand Profession in the Modern World?...
- A Auto and Moto How Can Parking Sensors Help Drivers?...
- H Health and Medicine What is the Normal Blood Sugar Level in a Healthy Person?...
- F Food and Cooking Red Caviar: How to Choose the Best?...
- C Computers and Internet Clearing Cache: How to Speed Up Your Browser...
- S Style and Beauty How are artificial nails removed?...
- S Style and Beauty Secrets of Tying a Pareo: 5 Ways...
- F Food and Cooking Everything You Need to Know About Pasta...
Answers on questions: Mathematics
- M Mathematics The radius of a cylindrical water tank is 4.5 ft, and its height is 12 ft. What is the volume of the tank? Use the value 3.14 for 11, and round your answer to the nearest whole...
- M Mathematics Please look at the image...
- H Health THC is the active ingredient in: a cocaine. b methamphetamines. c heroin. d marijuana....
- M Mathematics Please help me answer this. I’ll give a reward. To who every answers it correctly....
- P Physics Why don t protons stick together...
- M Mathematics Respond to this for 5 points! i know it s not that much but just respond anything you want 3...
Ответ:
First, you need to remember the relation:
speed = distance/time
We know that she needs to arrive at her friend's wedding at 3:00.
We also know that the total distance between her house and the wedding is 97 miles.
Now we need to find the total time that she needs to arrive at the wedding, so we can estimate at which hour she needs to start the travel.
The first 20 miles are driven att 30 miles per hour.
Then:
distance = 20mi
speed = 30mi/h
30mi/h = 20mi/T
T = 20mi/(30mi/h) = 0.67 hours.
The next 12 miles are driven at 45 mi/h
then:
45mi/h = 12mi/T
T = (12mi/(45mi/h)) = 0.27 hours
And the remainder distance is traveled at 65 mi/h
First, at this point she did travel 20mi + 12mi = 32mi
And we know that the total distance was 97mi, then the remaining distance is:
97mi - 32mi = 65mi
Then now she travels 65 miles at the speed of 65mi/h
then:
65mi/h = 65mi/(T)
T = (65mi)/(65mi/h) = 1 hour
Then the total time needed for the travel is:
Time = 0.67 hours + 0.27 hours + 1 hour = 1.94 hours.
knowing that 1 hour = 60 min
0.94 hours = 0.94*(60 min) = 56.4 min
time = 1 hour and 56.4 min
Meaning that she needs to leave her house around two hours before 3:00
So she would need to leave her house at around 1:03