Question

a tug boat goes 120 miles upstream in 15 hours but downstream in 5 hours find the speed of the tugboas is ? mph and current speed is ?

Answer 1

If you want to help @Chlorophyll, go ahead

Answer 2

@Hero I'm not great at explanation. I'd rather to shadow you :)

Answer 3

can someone please help me I have to ace this test

Answer 4

I'm about to go to bed

Answer 5

5 ( v + c) = 120
15( v - c) = 120
@bigmommatiad Can you solve it?

Answer 6

no that is more confusing now
would yo udivide 120 by 5 and then 120 by 15 to get the mph and current

Answer 7

V = velocity, c = current

Answer 8

5 ( v + c) = 120 downstream
15( v - c) = 120 upstream

Answer 9

but how do I get what the v and c is that is where I am lost

Answer 10

i thought that I would divide the 120 by 15 and the 120 by 5

Answer 11

Yes
-> v + c = 60
v - c = 8
Now add them together, ...?

Answer 12

so the tugboat is 60 and the current is 8

Answer 13

You don't know how to solve system of 2 unknowns ?

Answer 14

omg I am going to flunk this test that I have been studying for all week

Answer 15

to me no I do not think

Answer 16

if I add them together it would be 68

Answer 17

Add them VERTICALLY!
2V .....

Answer 18

-> v = ....

Answer 19

2v-2c=68

Answer 20

+ C - C = ..?

Answer 21

You have 1 candy, then you eat 1 candy, what left?

Answer 22

0

Answer 23

Assume C is candy!
Now go back to the equation, after adding vertically:
-> 2v .... = ?

Answer 24

2v=68 then you would divide 68 b 2 to get v correct?

Answer 25

Please do so, por favor :)

Answer 26

so that would be v=34

Answer 27

Yes, now plug v = 34 into v - c = 8 => c = ...?

Answer 28

34-c=8=> c=42 dont you add the 34 to both sides or subtract it

Answer 29

v - c = 8
v - 8 = c

Answer 30

so that would be 34-8 which is 26 for c.....so the tugboat is 34 and the current is 26?

Answer 31

Test your results by plugging back !

Answer 32

omg so if I started at 68 then that means that the tugboat is 68 and the current is 26 please say I am

Answer 33

sorry I am just freaking out on this test

Answer 34

what does that mean

Answer 35

Look what you wrote "2v=68 then you would divide 68 b 2 to get v correct? "

Answer 36

correct

Answer 37

then " so that would be v=34 "

Answer 38

so that would mean that 68 is tugboat and 34 would be current?

Answer 39

V = velocity of tugboat , c = current

Answer 40

v=tugboat and that would be 34 mph and current would be 0?

Answer 41

no the current would be 26

Answer 42

You also wrote " so that would be 34-8 which is 26 for c.....so the tugboat is 34 and the current is 26? "

Answer 43

wow that so much are you going to be here longer cuz I am sure I am going to need more help.

Answer 44

You definitely need to review this solution couple of dozens times to understand how to solve both ONE unknown and 2 unknowns. Good luck with your test :)

Answer 45

do have a question if 120/15 is 8 how come the 120/5 is not 24 instead of 60

Answer 46

@bigmommatiad Great job, I'm glad that you've caught my mistake =)
So now you can practice solving it correctly:

5 ( v + c) = 120 downstream
15( v - c) = 120 upstream

-> v + c = 24
-> v - c = 8