Question

a boat travels 10 miles upstream in 2 hours. Going downstream it can travel 30 miles in the same time. Find the speed of the boat in still water. what would the formula look like and how would i solve formula

Answer 1

let the speed of boat in still water be x
let speed of stream be y

Answer 2

when we go up stream the speed gets subtracted:
upstream speed is: x-y

Answer 3

when we go down stream the speed gets added:
down stream speed is: x+y

Answer 4

we know speed is distance/time use this
you will get 2 equations
solve them simultaneously

Answer 5

so what numbers would i put where?

Answer 6

30-10/x+y?

Answer 7

nopes

Answer 8

10/2=(x-y)

Answer 9

30/2=(x+y)

Answer 10

its that

Answer 11

i hope you get it now

Answer 12

but that would give us the answer of 10/4
no 5

Answer 13

just let me check

Answer 14

what answer did you get as 10/4

Answer 15

speed of boat is 10

Answer 16

speed of stream will be 5

Answer 17

some calculation error must be there. check it

Answer 18

d =rt and r = (b±c)

10 = (b-c)2
30 = (b+c)2

10/2 = b-c
30/2 = b+ c

5 = b-c
15 = b + c

20 = 2b

20/2 = b

10 = b

15 - 10 = c
5 = c


Therefore
b = 10
c = 5

Answer 19

i did and both times i came out to different equations
the 10/4 was a typing error
i meant to say 20/4 which would give u have

Answer 20

ya so thats 5 anf will give you speed of stream