Question

Which is the best estimate of the speed Morris is traveling? 1 mile = 5,280 feet

Answer 1

First, we need to have consistent units. We have miles and feet here. Also, we have different units of time. Lets use the given conversion factor for length and another conversion factor for time.

3600 sec = 1 hr


Let's use the unit miles per hour.

Since Aneesha has the units we want to use, we need to convert Morris'.


Set up a proportion to find Morris' distance in miles.

1 / x = 5280 / 3


Cross multiply.

5280x = 3
x = 0.000568 miles

so

3 feet = 0.000568 miles

Now we convert his seconds to hours.

1 sec = (1 / 3600) hr
1 sec = 0.000278 hr


Finally, we can divide the two numbers to get miles per hour.

(0.000568 miles) / (0.000278 hr) = 2.043 miles per hour


Here are the speeds of the two people.

Aneesha = 50 mph
Morris = 50 mph - 2.043 mph = 47.957 mph