Unit conversion

Question

At 11:10am you pass exit 72 and at 11:25am you pass exit 82.

How fast are you traveling? 

Round to the nearest integer in both of the following conversions.  

Give an answer in miles per hour, 

  miles per hour

and also in kilometers per hour.

  km per hour

Answer 1

exit 72 is at the 72 mile marker (or vacinity).

In 15 minutes you went 10 miles. Your speed is 40mph.

A km is 2/3mile (roughly). 40/2,/3=60kmh.

64.37 from the computer.

Answer 2

SInce you are travelling 10 miles in 15 minutes = 10 miles/ 15 minutes = 0.6 miles/min. To convert this to miles per hour you would use the conversion factor of 60 min/hr

0.66 miles/min x 60 min/hr = 40 miles/hr. (the units of min cancel to give miles/hr.

To convert into km/hr use the conversion factor 1 km = 0.621371 mi.

40 miles/hr x 1 km/0.621371 miles = 64 km/hr