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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?

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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

#2
+102466
+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
+520
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## average speed = (total distance) / (total time)

Jul 5, 2015
#2
+102466
+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?

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

Melody Jul 5, 2015