SOLUTION: a man divide his journey in his three equals part and travells in each of the part with speed of 6o km /hour , 30 km/hour and 10 km/hour .what is the avg speed for total travells?

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Question 384400: a man divide his journey in his three equals part and travells in each of the part with speed of 6o km /hour , 30 km/hour and 10 km/hour .what is the avg speed for total travells?
Found 2 solutions by ewatrrr, Alan3354:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi,         

journey divided into three 'equal parts':

Average speed = (60kmph + 30kmph + 10kmph)/3  = 100/3 = 33 1/3 kmph

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
a man divide his journey in his three equals part and travells in each of the part with speed of 6o km /hour , 30 km/hour and 10 km/hour .what is the avg speed for total travells?
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total distance = 3d, each section = d
d = rt
t = d/r
t = d/60 + d/30 + d/10 = (18/120)*d = total time for 3d
r = (120/18)*3
r =~ 20 km/hr