how long will it take to walk 3 1/2 miles at a rate of 2 1/2 miles per hour

distance= rate*time

3.5=2.5*time
solve for time

time = distance/speed

= 3.5/2.5 = ....

To calculate how long it will take to walk a certain distance at a given rate, you can use the formula:

Time = Distance / Rate

Given that the distance is 3 1/2 miles and the rate is 2 1/2 miles per hour, let's calculate the time it will take to walk this distance.

First, convert the mixed numbers (3 1/2 and 2 1/2) into improper fractions to make calculations easier:

3 1/2 = (2 * 3 + 1) / 2 = 7/2
2 1/2 = (2 * 2 + 1) / 2 = 5/2

Now let's plug in the values into the formula:

Time = 7/2 miles / 5/2 miles per hour

Dividing two fractions is equivalent to multiplying the first fraction by the reciprocal of the second fraction:

Time = (7/2) * (2/5)

Multiply the numerators and denominators:

Time = (7 * 2) / (2 * 5)
= 14 / 10

Simplify the fraction if needed:

Time = 7/5

Therefore, it will take 7/5 hours to walk 3 1/2 miles at a rate of 2 1/2 miles per hour.

As a decimal, 7/5 hours is equivalent to 1.4 hours or 1 hour and 24 minutes.