Apex231 wrote:
Apex231 wrote:
I am still not sure of how to correctly identify whether time or distance be considered as value/weight in weighted avg formula. Is there a generic rule to identify this?
Can someone explain why time and not distance is considered in weighted avg formula for speed?; just trying to understand concepts.
Speed is measured in miles/hr.
The weights will be in 'hr'
Look at the weighted average formula:
Cavg = (C1*w1 + C2*w2)/(w1 + w2) = miles/hr = (miles/hr * hr + miles/hr * hr) / (hr + hr) = (miles + miles)/(hr + hr) i.e. total distance/total time
weights cannot be distance: miles/hr = (miles/hr * miles + miles/hr * miles) / (miles + miles) -> miles^2/hr is no physical quantity.
Did you check out the link I gave you above? It discusses this concept with miles/gallon. Weights should be in gallons here.
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Karishma
Veritas Prep GMAT Instructor
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