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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