The speed of a boat in still water is 5 kilometre per hour it can go 15 km upstream and 28 km downstream in 5 hours find the speed of the stream plz answer step by step

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rschaum08

28.11.2020

Mathematics

Part 1) The diameter is $D=20.38\ cm$

Part 2) The radius is $r=10.19\ cm$

Part 3) The length of an arc is equal to $33.78\ cm$

Step-by-step explanation:

Part 1) Find the diameter

we know that the circumference of a circle is equal to

$C=\pi D$

where

D is the diameter

we have

$C=64\ cm$

assume

$\pi =3.14$

substitute and solve for D

64=(3.14)D

$D=64/(3.14)=20.38\ cm$

Part 2) Find the radius

we know that

The radius is half the diameter

r=D/2

substitute

$r=20.38/2=10.19\ cm$

Part 3) Find the length of an arc of 190 degrees

we know that

The circumference of the circle subtends a central angle of 360 degrees

using proportion

$\frac{64}{360}=\frac{x}{190}\\ \\ x=64*190/360\\ \\x=33.78\ cm$

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