1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
umka2103 [35]
3 years ago
8

A motorboat travels 448 kilometers in 8 hours going upstream and 440 kilometers in 5 hours going downstream. What is the rate of

the boat in still water and what is the rate of the current?
Mathematics
1 answer:
liubo4ka [24]3 years ago
4 0

9514 1404 393

Answer:

  • boat: 72 km/h
  • current: 16 km/h

Step-by-step explanation:

The speed difference between boat and current is the upstream rate:

  (448 km)/(8 h) = 56 km/h

The sum of speeds of boat and current is the downstream rate:

  (440 km)/(5 h) = 88 km/h

The rate of the boat is half the sum of these:

  (56 +88)/2 = 72 . . . km/h

The rate of the current is half their difference:

  (88 -56)/2 = 16 . . . km/h

The rate of the boat is 72 km/h; the rate of the current is 16 km/h.

You might be interested in
Which of these tables best represents the equation y = 5x – 8
solong [7]
Which tables since there’s no picture
6 0
3 years ago
Simplify the product. 5a^2(3a^4 + 3b)
Irina-Kira [14]

Answer:

15a^6 + 15a²b

3 0
3 years ago
A family has 2 cars. the first car has a fuel efficiency of 15 miles per gallon of gas and the second has a fuel efficiency of 2
lora16 [44]

Car 1: 15x

Car 2: 20y

15x+20y=1300

x+y=75

So y=75-x

15x+20(75-x)=1300

-5x+1500=1300

-5x=-200

x=40.

y=75-40

y=35

Car 1: 40 gallons

Car 2: 35 gallons


8 0
3 years ago
Pleaseeee Select the expression that correctly calculates the perimeter of this shape. 7 cm 7 cm​
jasenka [17]
77 I hope this helps bye
7 0
3 years ago
From the top of a lighthouse the angle of depression of a speed
otez555 [7]

Answer:

164m (to 3 s.f.)

Step-by-step explanation:

Please see the attached picture for the full solution.

5 0
2 years ago
Other questions:
  • I NEED HELP PLEASE!!!!!
    7·1 answer
  • What numbers multiply to make 9 but also add to make negative 10
    7·1 answer
  • What is the slope of the graph shown below?
    7·1 answer
  • The area of a rectangle is 5x^3+19+6x-18 with length x + 3. Using synthetic division, what is the width of the rectangle?
    6·2 answers
  • Tyrone has $500 in his savings account. He wants to save more money. He is looking at two investment plans. Under plan A, he wil
    5·1 answer
  • Help plsssssss no links or files
    15·1 answer
  • The perimetee are 81cm and the ratio sides are 2:3:4 find the area of triangle​
    5·1 answer
  • Plz help me!!!
    14·1 answer
  • Question<br> Estimate the perimeter of the figure to the nearest whole number.
    9·1 answer
  • Answer number 1 please
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!