hi guys, this is my problem:

in column A: vehicle no ( there are 10 vehicles)
column B: start km
column c : end km
clm D: km travelled
in clumn e: date
in clm f : tyre replacement: 1,2,3,4,5 (can choose and number is the
location of the tyres)

now i wan to use a formula to return the cumulative distance travelled
by a vehicle when tyre of the same location is changed.(e.g location
1).

i wan to know how long a tyre ( for a certain location ) can last after
travelling for how many kilometres. (and it have to be the same vehicle
no!)

the scenario:
vehicle no start km end km tyre replacement(if any)

x1234 45 67 1
z4567 37 65
x1234 67 85
z4567 65 100 3
x1234 85 112 1


result :112-67=

The key to this problem is that if one month later, x1234 has tyre
change at 1 and the end km is recorded at 250( e.g) The result wil be
250-112


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cjjoo
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