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Average Speed

IGCSE,mathematics,Cambridge,examination,Algebra,numbers,distance,time,mean,hours,minutes,seconds,conversion,division,fractions
This item is taken from IGCSE Mathematics (0580) Paper 23 of October/November 2010.

To deal with this item, let us summarize the details of the problem:
   (a) Syllabus area: Algebra
   (b) Specific topic: Average Speed
   (c) Formula Needed: 
IGCSE,mathematics,Cambridge,examination,Algebra,numbers,distance,time,mean,hours,minutes,seconds,conversion,division,fractions
Let us identify the given in the problem:
IGCSE,mathematics,Cambridge,examination,Algebra,numbers,distance,time,mean,hours,minutes,seconds,conversion,division,fractions
Take note that the given time is in minutes and seconds. The problem requires us to convert it into hours. Using the conversion factors,
IGCSE,mathematics,Cambridge,examination,Algebra,numbers,distance,time,mean,hours,minutes,seconds,conversion,division,fractions
We can now find the average speed by dividing the total distance taken and the total time spent.
IGCSE,mathematics,Cambridge,examination,Algebra,numbers,distance,time,mean,hours,minutes,seconds,conversion,division,fractions
Therefore, the average speed of Priyantha is 10.8 km/h or 10 70/83 km/h. 

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