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155 calculate idle time

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155 calculate idle time

by ern5231 » Tue Oct 06, 2009 10:35 pm
Said that a person altogether had took 23 minutes from apartment to office. How long did the person halt?

(1) The speed is 40 mph
(2) Distance is 13 miles
Last edited by ern5231 on Wed Oct 07, 2009 1:05 am, edited 1 time in total.
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by sunnyjohn » Tue Oct 06, 2009 10:48 pm
I) average velocity = total distance/ total time

distance = 40*23/60 ==> 46/3 miles ==> 15.33 miles.

?? - no clue of idle time here...

ii) distance/time = average velocity

13*60/23 ==> some value..

combine I and II) -

13/40 ==> total time

19.5 min ==> total time

total time= idle time + normal walking time

this is quite strange..?
are u sure..they said - average velocity
or just velocity?
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by ern5231 » Wed Oct 07, 2009 1:06 am
edited the post...my mistake...
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by sunnyjohn » Wed Oct 07, 2009 1:14 am
then i think Answer should be C.
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