Excel Finding average speed -

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i have got 1500 rows of travels. in column have got total time on travel, in column b total km driven. in column c did calculation on average speed of specific travel. whats best way calculate average speed of travels? lengths 0 20 kms approx, time shorter 1 hour. first eliminated travels shorter 2 km managed frequency table , have written frequencies of speeds in 0-5,5-10,... km/h. can histogram, should eliminate more data or how approach problem?

in cell enter:

=sum(b:b)/sum(a:a)

a common error try average values in column c.


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