Question

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A man walks at the speed of 4
km/hr for first 1km, 6km/hr for
next 1 km. What is his average
speed for 2 km?
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Answer 1

Answer:

Average speed =total distance/total time

for first, let t=1

for second let t =2

average speed=2 km / t1+ t2

As, time = distance / speed

t1=6

t2= 1/4

avg speed=2/1/6+1/4

avg speed =2/10/24

avg speed=48/10

avg speed =4.8