John bikes for 2 hours at a speed of 15 miles per hour. How many hours will it take Shannon to cover the same distance at a speed of 10 mi/h?

Question

I want to know ow to sloave this 

Answer 1

It is always easier to solve this type of problems by setting them up as fractions. You have two pieces of information in the beginning. 2 hours and 15 miles per hour. For 15 miles per hour, it means the same thing as 15 miles per 1 hour, and per can be written as divide. 

http://tinyurl.com/klaqa3l

Looking at the picture above, you can always cancel matching numerators with denominators. The unit "hour" can be cancelled. So all you would have left is 2 times 15 miles, which will result in 30 miles.

So now the problem becomes how long it will take Shannon to cover 30 miles at a speed of 10mi/h. 

 

Hope this helps!