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During a race Ali ran the first 300 metres in 2 mins 10 secs and the last 100 metres in 30 secs. What was his average speed in m/s?

I need a little help with this. I think I know the answer but I'm not sure if its correct. Please help me out.

 Jul 5, 2015

Best Answer 

 #2
avatar+100006 
+10

Hi Gotcha,

 

During a race Ali ran the first 300 metres in 2 mins 10 secs and the last 100 metres in 30 secs. What was his average speed in m/s?

 

$$\\\frac{300+100metres}{2min+40seconds}\\\\
=\frac{400metres}{120+40seconds}\\\\
=\frac{400metres}{160seconds}\\\\
=\frac{5metres}{2seconds}\\\\
=2.5\;m/s$$

.
 Jul 5, 2015
 #1
avatar+520 
+5

average speed = (total distance) / (total time)

 Jul 5, 2015
 #2
avatar+100006 
+10
Best Answer

Hi Gotcha,

 

During a race Ali ran the first 300 metres in 2 mins 10 secs and the last 100 metres in 30 secs. What was his average speed in m/s?

 

$$\\\frac{300+100metres}{2min+40seconds}\\\\
=\frac{400metres}{120+40seconds}\\\\
=\frac{400metres}{160seconds}\\\\
=\frac{5metres}{2seconds}\\\\
=2.5\;m/s$$

Melody Jul 5, 2015

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