one third of a certain journey is covered at the rate of 25 km/h 1/4 at the rate of 30 km/h and the rest of 50 km/h what is the average speed for the whole journey? please give me the answer in one min and with correct explanation
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assume distance is 1 KM
.33 KM at 25 kmph
.25 km at 30 kmph
1-.25-.33 at 50 kmph
total time = .33/25 + .25/30 + .42/50
t = .0299
s = 1 km
avg speed = 1/.0299 = 33.44 kmph
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