![sierralynnbaldp16d4b](/avatars/24163.jpg)
sierralynnbaldp16d4b
26.02.2020 •
Mathematics
A boat travels 50 mi upstream against the current in the same amount of time it takes to travel 70 mi downstream with the current. If the current is 3 mph what is the speed of the boat in still water
Solved
Show answers
More tips
- S Style and Beauty Discover the Art of Nail Design: How Do You Paint Your Nails?...
- P Philosophy How to Develop Extrasensory Abilities?...
- O Other Everything You Need to Know About Kudyabliks...
- C Computers and Internet The Twitter Phenomenon: What it is and How to Use it...
- C Computers and Internet How to Choose a Laptop: Expert Guide and Tips...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
- S Style and Beauty How to Make Your Lips Fuller? Ideas and Tips for Beautiful Lips...
- C Computers and Internet How to Learn to Type Fast?...
Answers on questions: Mathematics
- S Social Studies Differences between social classes in the united states are based on a. income, lifestyles, and beliefs. b. cultural background. c. age. d. race....
- M Mathematics Which of the following is a logical conclusion to the conditional statements below a. read = book b. words = book c. words = read d. books= words...
- S Spanish Read and match the sentence with its correct pronoun. Match Term Definition Marta s family helps around the house. A) You My soccer team practices at school on...
Ответ:
the speed of the boat in still water is 18 mph
Step-by-step explanation:
Let x represent the speed of the boat in still water.
If the current is 3 mph and the boat travels 50 miles upstream against the current, the total speed of the boat would be (x - 3) miles
Time = distance/speed
Time taken for the boat to travel 50 miles upstream is
50/(x - 3)
In the same amount of time, the boat travels 70 miles downstream with the current. The total speed of the boat would be (x + 3) miles. Time taken for the boat to travel 70 miles upstream is
70/(x + 3)
Since the time is the same, then
50/(x - 3) = 70/(x + 3)
Cross multiplying, it becomes
70(x - 3) = 50(x + 3)
70x - 210 = 50x + 150
70x - 50x = 150 + 210
20x = 360
x = 360/20
x = 18 mph
Ответ:
B. return on investment
Step-by-step explanation:
Return on Investment (ROI) is a performance measure used to evaluate the efficiency of an investment or compare the efficiency of a number of different investments.