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    ljackson30's Avatar
    ljackson30 Posts: 2, Reputation: 1
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    #1

    Apr 15, 2007, 06:09 PM
    Average Speed Formula
    How would one write a formula to find the average speed if one knows the distance traveled and the rate of speed for each portion of the trip?

    20 miles at m speed
    40 miles at n speed
    manimuth's Avatar
    manimuth Posts: 261, Reputation: 60
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    #2

    Apr 15, 2007, 06:54 PM
    Here's a hint: The units for average speed is m/h (miles/hour[or any other unit of time, really]), right? So... get the total miles over the total time. (How? It's your homework :) )

    What? You don't know the hours? If I went at a speed of 60 miles/hour for 60 miles, how long did I travel? If you said 1 hour you are right. Use the same logic.

    Good luck.
    ljackson30's Avatar
    ljackson30 Posts: 2, Reputation: 1
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    #3

    Apr 16, 2007, 03:34 AM
    I don't know the speed nor the time. All I am given is the distance.
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #4

    Apr 16, 2007, 03:45 AM
    You need to work out total distance divided by total time. You have plenty enough information to do that. You ARE given the speed...

    Speed = distance/time will giv eyou the answer.
    GUESTS 9's Avatar
    GUESTS 9 Posts: n/a, Reputation:
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    #5

    Apr 8, 2008, 06:32 PM
    average speed = delta distance divided by delta time

    vav = dd / dt

    ps. D = delta
    punkmax's Avatar
    punkmax Posts: 1, Reputation: 1
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    #6

    May 7, 2008, 04:05 AM
    Is the answer for the average speed like this:

    3nm/(n + 2m) ?

    Thanks.

    Quote Originally Posted by ljackson30
    How would one write a formula to find the average speed if one knows the distance traveled and the rate of speed for each portion of the trip?

    20 miles at m speed
    40 miles at n speed
    j199279's Avatar
    j199279 Posts: 2, Reputation: 1
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    #7

    Aug 19, 2009, 12:32 PM
    60
    ------
    2m+n

    Because

    You know that the formual for average speed?
    So
    You can get
    20+40
    --------
    t1+t2
    But you don't know t1 and t2

    To find time
    The formula is d/r
    Now you can substitute

    20+40
    -------------
    20/m+ 40/n

    Which is 60/20n+40m
    j199279's Avatar
    j199279 Posts: 2, Reputation: 1
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    #8

    Aug 19, 2009, 12:34 PM

    Sorry I got a mistake which is the first part
    Just ignore below this

    60
    ------
    2m+n
    dnkulkarni's Avatar
    dnkulkarni Posts: 1, Reputation: 1
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    #9

    Oct 18, 2009, 09:38 PM
    ans : if the distances are considered as d1 and d2 and speed as s1 and s2 then average speed =

    = (d1 + d2 ) / ( d1 / s1 + d2/s2 )

    if d1 = d2 i.e. over same distance then

    avg speed = 2 S1* S2 / (S1 + S2)
    kmpm's Avatar
    kmpm Posts: 3, Reputation: 1
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    #10

    Nov 17, 2009, 06:00 AM

    100m (Distance) 44 sec (time)=Speed
    kmpm's Avatar
    kmpm Posts: 3, Reputation: 1
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    #11

    Nov 17, 2009, 06:01 AM

    Distance 100m time 44 sec what is the speed
    kmpm's Avatar
    kmpm Posts: 3, Reputation: 1
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    #12

    Nov 17, 2009, 06:05 AM
    100m distance time 44 seconds what is the speed
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #13

    Nov 17, 2009, 06:19 AM
    average speed = total distance/total time
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #14

    Nov 17, 2009, 06:19 AM

    You should have created your own thread.

    Use:

    snail293's Avatar
    snail293 Posts: 1, Reputation: 1
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    #15

    Jan 7, 2010, 10:11 PM
    average speed=total distance:time
    Lihim.88's Avatar
    Lihim.88 Posts: 2, Reputation: 1
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    #16

    Jul 7, 2010, 03:41 AM
    Hey guys! What if there is 3 distances? For example, Vi = 6miles/no time Vii = 45miles/1hr and Viii = 1.5miles/30mins? Should I say that the time would be 2hrs or 1hr and 30mins? For a total of 90mins? Thanks!
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #17

    Jul 7, 2010, 07:07 AM
    Quote Originally Posted by Lihim.88 View Post
    Hey guys! What if there is 3 distances? For example, Vi = 6miles/no time Vii = 45miles/1hr and Viii = 1.5miles/30mins? Should I say that the time would be 2hrs or 1hr and 30mins? For a total of 90mins? Thanks!
    Please do not double post questions. See: https://www.askmehelpdesk.com/mathem...ed-486088.html
    lil_skie27's Avatar
    lil_skie27 Posts: 1, Reputation: 1
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    #18

    Sep 16, 2010, 04:13 PM
    Hehehe I'm so happy to find they missing formulas... :)
    giga_rex's Avatar
    giga_rex Posts: 1, Reputation: 1
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    #19

    Oct 18, 2010, 07:10 PM
    The formula is
    d1+d2
    t
    mark26's Avatar
    mark26 Posts: 2, Reputation: 1
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    #20

    Nov 23, 2010, 05:17 AM
    An aircraft travels 2150 nuatical miles in 2 hours 30 minutes. What is the average speed of the aircraft?

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