A person walks first at constant speed of 5.00 m/s along a straight line from point A to point B and then back along the line from B to A at a constant speed of 3.00 m/s. What is her average speed over the entire trip?

- lgbasallote

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- anonymous

:/

- anonymous

30/8

- lgbasallote

15 meters?

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## More answers

- lgbasallote

why not just 1? i mean it's simpler isnt it?

- shubhamsrg

total dist = 2d
total time = d/5 + d/3 = 8d/15
so avg speed = 2d/(8d/15)
so @A.Avinash_Goutham was right!! yet again! :D

- anonymous

4m/s

- lgbasallote

so it will be 30/8 seconds?

- anonymous

When the distance is fixed, just find the harmonic mean.

- lgbasallote

i mean m/s

- lgbasallote

what does harmonic mean mean again?

- anonymous

For two number a and b the harmonic mean is given by 2ab/(a+b)

- kropot72

Speed = (distance traveled)/(time taken)
Total distance traveled = 0
Speed = 0 m/s

- lgbasallote

where a and b are...?

- lgbasallote

the given values?

- cwrw238

speed = distance / time
if distance = 1
5 = 1 / 0.2
also
3 = 1 / 0.3333
average speed = 2 / 0.53333

- anonymous

a=5 and b =3 or vice-versa

- anonymous

its 3.75 m/s 4 is wrong

- anonymous

if it's equal " time " u shud use........arithmetic nd equal dist u shud use..........harmonic

- lgbasallote

this is effective everytime d is equal?

- anonymous

total distance /total time travelled

- anonymous

Yes lgba and when time is equal find the arithmetic mean.

- lgbasallote

arithmetic mean is..?

- anonymous

2d
-----------
d +d
-- ----
5 3
2d
---------
8d
------
15
2
----
8
------
15

- anonymous

2
----
8
---
15
15
----
4

- lgbasallote

lol yeah i got that part =)) btw...a follow-up question is what is the average velocity...the book says zero...is it because displacement is 0?

- anonymous

yeah it is zero

- shubhamsrg

yes,,because disp is 0..

- anonymous

but its speed written in the question???

- lgbasallote

the first question was average speed

- anonymous

yeah but there is a difference displacement can come to zero bot distance cannot u should mention adds up whether how many time come and go from same point asdisplacement get zero

- anonymous

distance adds up*

- anonymous

lol really? at 5m/s ?

- lgbasallote

what? o.O

- anonymous

A person walks first at constant speed of 5.00 m/s <== that guy must be one heck of a power walker haha

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