SOLUTION: Calculate the speed of the following: A man runs 1000 metres in 184 seconds (calculate his speed in kiometres per hour) thankyou

First let's make a "chain path" to go from meters (m) to 
kilometers (km) and a "chain path" to go from seconds (s)
to hours (h)

m (meters) --> km (kilometers) 

s (seconds) --> min (minutes) --> h (hours) 

Put 1000m over 184s, and parentheses around it:



Now create a unit fraction to multiply by with 
a denominator which will cancel out the "m" on 
the top, and a numerator to bring in "km" on the
top:  

Since 1000m = 1km, we create the unit fraction 
 to multiply it by:

  

Now the "m"s cancel, and, incidentally,
so do the 1000's!:



Next we create a unit fraction to multiply by with 
a numerator which will cancel out the "s" on 
the bottom of the first fraction, and a denominator
to bring in "min" on the bottom:

Since 60s = 1min, we create the unit fraction 
 to multiply it by:


Now we see that the "s"s cancel:



Next we create a unit fraction to multiply by with 
a numerator which will cancel out the "min" on 
the bottom of the third fraction, and a denominator
to bring in "h" on the bottom:

Since 60min = 1h, we create the unit fraction 
 to multiply it by:



Now we see that the "min"s cancel:



Now the only units we have left are "km" on the 
top and h on the bottom, so we multiply all the 
numerators together on top and bottom and get:



Then finally we divide 3600 by 184 and get 
19.56521739.  So, rounding off to tenths we end 
up with the final answer: 


 
Edwin