Exam Question - Speed/Distance/Time

Today's task is to work out the average speed of a car journey.

Question:

David travels to work from home. The journey takes 1hr 25mins. The journey is 75km. 

Calculate David'd average speed in km/h. Give your answer to 3sf.

 

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ANSWERS

1) Speed = Distance/Time. We must input the values we know which are Distance (75km) and Time (1hr25mins)

Therefore, 75 / (1+25/60). [Remember to write the time as a fraction with 60 as the denominator]

This equals 52.9 km/h to 3sf.