Ask Experts Questions for FREE Help !
Ask
    JB123's Avatar
    JB123 Posts: 1, Reputation: 1
    New Member
     
    #1

    Sep 5, 2009, 09:30 AM
    Average Speed Problemo! Ayudame!
    The record for a marathon is 4 h, 21 min, 21 s. The marathon distance is 83.16 km. Determine the average speed in m/s of a runner achieving this record.

    I thought I got the right answer... but apparently it's wrong. I divided 83160, which is km in meters by 14421, which is the time in seconds. BUT ITS STILL WRONG.

    HELP ME! Pleaseeee:]
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
    Home Improvement & Construction Expert
     
    #2

    Sep 5, 2009, 10:03 AM

    4 hr = 240 min + 21 min = 261 min X 60 sec = 15660 sec + 21 sec = 15681 sec.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
    Ultra Member
     
    #3

    Sep 5, 2009, 10:07 AM
    You divided by the wrong number. It should be 15,681 seconds.

    There are 83,160 meters. This was ran in 15,681 seconds.



    That is a good pace. That translates to about 11.86 mph.

Not your question? Ask your question View similar questions

 

Question Tools Search this Question
Search this Question:

Advanced Search


Check out some similar questions!

Average speed and average velocity [ 2 Answers ]

Every morning you jog around 250 meter track four times in 30 minutes. What is your average speed and average velocity?

Average speed [ 3 Answers ]

For each of the distances, find the average speed of the world champion runner. Distnace Time 100m 9.8 seconds 400m 43.2sec 800m 1 min 41 sec 1,500m 3 min 26 sec PLEASE HELP:confused:

Average speed/average velocity [ 1 Answers ]

A horse canters away from its trainer in a straight line, moving 150 m away in 19.0 s. It then turns abruptly and gallops halfway back in 4.6 s. (a) Calculate its average speed. m/s (b) Calculate its average velocity for the entire trip, using "away from the trainer" as the positive...

Average Speed [ 2 Answers ]

What two properties does average speed consist of? :confused:

Speed average [ 1 Answers ]

A bicyclist rides up a 10 mile hill at a constant speed of 10 MPH. He arrives at the top and heads down to the bottom at a constant speed of 30 MPH What is his average speed for the round trip?


View more questions Search