SOLUTION: a man drives to his office at 60km/hr and returns home along the same route at 30km/hr. Find the average speed?

Question 887960: a man drives to his office at 60km/hr and returns home along the same route at 30km/hr. Find the average speed?

Found 2 solutions by josgarithmetic, Alan3354:
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
{totalDistance}/{totalTime}

d is distance each way.
, .

, total time
, total distance
, average speed. Simplify that and it will be your finished result.
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
a man drives to his office at 60km/hr and returns home along the same route at 30km/hr. Find the average speed?
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Avg = 2*60*30/(60 + 30) = 3600/90
= 40 km/hr
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It's similar to parallel resistors and parallel flows.
Notice that the distance is not a factor.
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