You swim 3.6 kilometers per hour. How long (in minutes) will it take you to swim the distance $d$ across the pond?

[McCold]

I have already made my proportion to be 80/140 = 60/3.6 and then i divided 60/3.6 and got that, So I am wondering if I got it right? Thank you.

 

[Deleted member 4993]

I have already made my proportion to be 80/140 = 60/3.6 and then i divided 60/3.6 and got that, So I am wondering if I got it right? Thank you.View attachment 24735

You write:

80/140 = 60/3.6 ..........................................Incorrect

Please share your work - if you want us to check it!

For that first you need to calculate AC = ?

Then calculate CD =?

 

[Steven G]

You need to solve d/105 = 80/140

Multiply both sides by 105 and get d = 105*80/140 = 60
So d = 60m 60m(.001 km/m) = 0.06 m

 

[McCold]

Please share your work - if you want us to check it!

Show us how did you arrive at the answer of 16 2/3 minutes!

I did... I did a proportion and then used it to divide 60/3.6

 

[McCold]

I already submitted my work, my teacher finally answer me. Thanks.

 

[Deleted member 4993]

I did... I did a proportion and then used it to divide 60/3.6

The work you showed is incorrect.

You said:

80/140 = 60/3.6.................................................Incorrect​

But​

80/140 = 4/7​

and it is no where near 60/3.6 ......

 

[McCold]

The work you showed is incorrect.

You said:

80/140 = 60/3.6.................................................Incorrect​

But​

80/140 = 4/7​

and it is no where near 60/3.6 ......

Oh Ok, No I meant a proportion, sorry for the confusion.

 

[McCold]

Oh Ok, No I meant a proportion, sorry for the confusion.

But truthfully I said it was a proportion, sorry if you did not see that

 

[Steven G]

You are being asked where the 3.6 came from. None of the sides are 3.6

 

[McCold]

You are being asked where the 3.6 came from. None of the sides are 3.6

The 3.6 is what I highlighted (lol) its the Kilometres per hour.

 

[Dr.Peterson]

I have already made my proportion to be 80/140 = 60/3.6 and then i divided 60/3.6 and got that, So I am wondering if I got it right? Thank you.View attachment 24735

I did... I did a proportion and then used it to divide 60/3.6

Let's start over, since this hasn't gone very well.

It's good that you showed some work; but you didn't clearly state what that work means. Just writing a calculation isn't enough; and calling something a proportion when it is not only adds to the confusion.

What you appear to have meant is that you wrote the proportion 80/140 = d/105 and correctly solved that to find that d = 60 m, as Jomo showed (I'll correct a typo):

You need to solve d/105 = 80/140

Multiply both sides by 105 and get d = 105*80/140 = 60
So d = 60m; 60m(.001 km/m) = 0.06 km

But then you just divided 60 m by 3.6 km/h, which is meaningless.

The next step is to use the equation d = rt to find the time t, when you know distance d = 0.06 km (which we converted to km because units have to match) and r = 3.6 km/h. Solve this for t, which will be in hours. Then you have to convert that to minutes.

Okay? Your turn.

 

[McCold]

Let's start over, since this hasn't gone very well.

It's good that you showed some work; but you didn't clearly state what that work means. Just writing a calculation isn't enough; and calling something a proportion when it is not only adds to the confusion.

What you appear to have meant is that you wrote the proportion 80/140 = d/105 and correctly solved that to find that d = 60 m, as Jomo showed (I'll correct a typo):

But then you just divided 60 m by 3.6 km/h, which is meaningless.

The next step is to use the equation d = rt to find the time t, when you know distance d = 0.06 km (which we converted to km because units have to match) and r = 3.6 km/h. Solve this for t, which will be in hours. Then you have to convert that to minutes.

Okay? Your turn.

I all ready turned the assignment in, thank you for you help