it is a rate total distance example
Total distance 32Km+13=45Km
Total time = 2h+1h=3h so it is 45/3 which equals AVG. speed is 15Km/h
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excel formulas multipy and divide first if i remember corectly
5r2=80
The technique is known as algebra.
-1
a+2bc + d is d= a - 2bc