Hey Tesfay,
Your argument is absolutely right!
A car can not change its speed from 30 to 90 instantenously.
So, the answer is not 90 mile/hr. From both of your e-mail, I
can see you already know the answer, but did not phrase it correctly.
I will post the answer on monday.
Peace,
TedRos
>
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> Hi Ted
>
> To average 60m/h for two miles where the speed for the first mile is 30m/h
> and for the the second mile the speed is X m/h is as follow
>
> 60 m/h = (30 m/h + X m/h) / 2 m
>
> X m/h = 90 m/h
>
> This is means that the car must have an average of 90 m/h for the second mile
> since no car could can reach the speed from 30 m/h to 90 m/h with out
> accelarating. That is if the car was traveling at 30 m/h at the point of B
> then must accelarate to reach the speed so that the average would be 60 m/h.
> That is why I say the averrage speed from point B to Point C must be 90 m/h.
> But if there is a car that would accelerate from 30 m/h to 90m/h in 0
> seconds :-) then the car must have 90 m/h to average 60 m/h for the entire
> trip.
>
> But some how i feel this is too simple to be the answer you are Looking
> for!!!!
>
> Regards
> Tesfay S
>
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