Sp 2000 Dvd Recorder Manual

Here is the problem of the average speed a vehicle

A car travels a certain road with an average speed of 40km / h, and returns for her with an average speed of 60km / h. calculates the average speed on the round trip (not 50km / h) ...

Care !!!!! the first thing that would happen we would add the speed and divide into 2 which would give us 50kms / h

but this way is wrong. The first thing to do is remind us of the speed equation

is speed = distance / time, this we can deduce the time, time = distance / speed.

time round we do not know, but we deduce the equation that is distancia/40 (see page) and return time distancia/60 the same way, time is the sum total trip time over time back.

resulting t = D/24. Now this time we replace the rate equation (see fact sheet).

and then we realize that the average speed is 48Kms / h