Martin can travel 189 miles in 3 hours. At this rate, how many miles can he travel in 9 hours?

9 hr * 189mi/3hr = ___ mi

or, as a proportion,
x/9 = 189/3

To find out how many miles Martin can travel in 9 hours at the same rate, we can set up a proportion.

The given rate is that he can travel 189 miles in 3 hours. Let's call the distance he can travel in 9 hours "x".

So we can set up the proportion as follows:

189 miles / 3 hours = x miles / 9 hours

To solve for x, we can cross-multiply and solve for x:

3 * x = 189 * 9

3x = 1701

Divide both sides by 3:

x = 1701 / 3

x = 567

Therefore, Martin can travel 567 miles in 9 hours.

To find out how many miles Martin can travel in 9 hours, we can use the concept of a rate. A rate is the amount of something (in this case, miles) divided by the amount of time it takes (in this case, hours).

Given that Martin can travel 189 miles in 3 hours, we can calculate the rate as follows:

Rate = Distance / Time

Rate = 189 miles / 3 hours

Rate = 63 miles per hour

Now that we have the rate, we can use it to find out how many miles Martin can travel in 9 hours. We simply multiply the rate by the number of hours:

Distance = Rate x Time

Distance = 63 miles per hour * 9 hours

Distance = 567 miles

Therefore, Martin can travel 567 miles in 9 hours.