Average Speed Formula

Average Speed Solved Examples

Problem 1: A runner sprints at a track meet. He completes a 1000-meter lap in 1 minute 30 sec. After the finish, he is at the starting point. Calculate the average speed of the runner during this lap?
Answer:

Given:

Total distance covered by the runner = 1000 meters

Total time taken =1minute 30 sec

= 90 sec
So, applying the formula for the average speed
we have,

1000/90

 11.1 m/s

Problem 2: A car travels at a speed of  40 km/hr for 2  hours and then decides to slow down to 30 km/hr for the next 2 hours. What is the average speed?
Answer:
D1 = 40 * 2 = 80 miles

D2 = 30 * 2 = 60 miles

Total distance D= D1+D2

D = 80 + 60

D = 140 miles

Average speed  Total Distance travelled/Total Time taken

= 140/4

  35 m/s
Read more: Average velocity

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