If the current in a stream moves at a rate of 7 mph. If a boat travels 98 miles downstream in the same time that it takes to travel 49 miles upstream then the speed of the boat in still water is 21 miles per hour.
<h3>What is speed?</h3>
Speed is the distance covered by an object in a certain time period. It is also known as velocity. The formula of speed is as follows:
Speed=Distance/ Time.
<h3>How to calculate speed?</h3>
We have been given that the speed of stream is 7miles per hour.
Let v be the speed of the boat, and t the time to travel
98=t*(7+v) (1)
49=t(v-7) (2)
(1)+(2) => 2tv=147
7t+(49+7t)=98
14t+49=98
14t=49
t=49/14
t=7/2
Put the value of t in equation 1 to get the value of v:
98=t(7+v)
98=7/2(7+v)
196/7=7+v
28=7+v
v=28-7
v=21
Hence if the current in a stream moves at a rate of 7 mph. If a boat travels 98 miles downstream in the same time that it takes to travel 49 miles upstream then the speed of the boat in still water is 21 miles per hour.
Learn more about speed at brainly.com/question/4931057
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Ron ate the most sandwiches because Jerry only ate 6/8 and that is lower than 7/8. 5/8 is also lower than 7/8
Answer:
<h2>3.14159</h2>
Step-by-step explanation:
A) Pi value using circumferences
C = circumference
d= diameter
Formula: C = Pi*d⇒Pi = C/d
Circle A)
Pi = 21.98/7 = 3.14
Circle B)
Pi = 18.84/6= 3.14
B) Using areas
A = area
r = radio = diameter/2
Formula: A = Pi*(r^2 )⇒ Pi = A/(r^2)
Circle A
Pi = 38.465/(3.5)^2= 3.14
Circle B
Pi= 28.26/(3^2)= 3.14
Answer:
No, they are co-planar.
Step-by-step explanation:
Points Q, R, X, and W are all in the plane QRXW. Planes do not have to be at ninety-degree angles (that is, straight up and down or straight to the left and right). However, the points Q, S, U, and X would not be coplanar as a plane must be a flat surface.
Answer:
Which point lies on a circle that is centered at A(-3, 2) and passes through B(1, 3)?
C(-1, -2)
D(-6, 3)
E(-3, -3)
F(-2, 6)
Step-by-step explanation:
eat it
