What is the Average Speed of a Boat Across a Lake?

[Makaroon]

Homework Statement

A boat moves 15.0 km across a lake in 30.0 min. What was the average speed of the boat in kilometers per hour?

Homework Equations

average speed: d/t

The Attempt at a Solution

ok since it is asking kilometers per hour that is the part tha confuses me.
i mean i believe that it is 15.0 km/30.0
but it is asking for hour...
sooo that where i get lost.

 

[LowlyPion]

That's what it did in 30 min.

How much would it do in an hour.

 

[Makaroon]

oh so then i multiply that times 2?

or would i do 15.0/60?

 

[Makaroon]

ok no..that doesn't make sense :S

 

[Hannisch]

If it goes x km in thirty minutes and keeps the same speed, wouldn't it go the same distance in the next thirty minutes?

 

[Makaroon]

ooh so then its the same..

 

[Nabeshin]

i mean i believe that it is 15.0 km/30.0
but it is asking for hour...
sooo that where i get lost.

Your 15km/30 is lacking one thing: Units on the 30. The 30 is in minutes, so this division would give you km/minute.

 

[Makaroon]

hm, but it is asking for kilometers per hour.

gosh sorry I'm soo ugh for this.

 

[Hannisch]

30 min is ½hour, right?

It goes 15km in ½hour - how much in 1 whole hour?

 

[Makaroon]

oh so then it is 30km/h?

 

[Hannisch]

Yep, that's it.

 

[Makaroon]

wow! thank you so much!
i truly appreciate it!