SOLUTION: A train travel 700 m in 35 Sec. What is its Speed in Km Per Hour?

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Question 656697: A train travel 700 m in 35 Sec. What is its Speed in Km Per Hour?
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!

Speed = Distance%2F%28Time%29 =

%28700m%29%2F%2835sec%29

Since 1000m = 1km,  1km%2F%281000m%29 = 1, we can multiply by that
without changing the value.

[We put "m" on the bottom to cancel the "m" on the top]:

%28700m%29%2F%2835sec%29×1km%2F%281000m%29

Since 60sec = 1min,  60sec%2F%281min%29 = 1, we can multiply by that
without changing the value.

[We put "sec" on the top to cancel the "sec" on the bottom]:

%28700m%29%2F%2835sec%29×1km%2F%281000m%29×60sec%2F%281min%29

Since 60min = 1hr,  %2860min%29%2F%281hr%29 = 1, we can multiply by that
without changing the value.

[We put "min" on the top to cancel the "min" on the bottom]:

%28700m%29%2F%2835sec%29×1km%2F%281000m%29×60sec%2F%281min%29×%2860min%29%2F%281hr%29

Now we cancel the m's:

%28700cross%28m%29%29%2F%2835sec%29×1km%2F%281000cross%28m%29%29×60sec%2F%281min%29×%2860min%29%2F%281hr%29

Now we cancel the sec's:

%28700cross%28m%29%29%2F%2835cross%28sec%29%29×1km%2F%281000cross%28m%29%29×60cross%28sec%29%2F%281min%29×%2860min%29%2F%281hr%29

Now we cancel the min's:

%28700cross%28m%29%29%2F%2835cross%28sec%29%29×1km%2F%281000cross%28m%29%29×60cross%28sec%29%2F%281cross%28min%29%29×%2860cross%28min%29%29%2F%281hr%29

and all we have left is

%28700%29%2F%2835%29×1km%2F%281000%29×60%2F%281%29×60%2F%281hr%29

%28700%2A60%2A60km%29%2F%2835%2A1000hr%29

2520000%2F35000km%2Fhr

72km%2Fhr

Edwin