An automobile travels on a straight road for 55 km at 20 km/h. It then continues in the same direction for another 60 km at 55 km/h. What is the average velocity (km/h) of the car during the full 115 km trip

Given :

Speed of automobile for first 55 km , .

Speed of automobile for first 60 km , .

To Find :

Average velocity of the full trip .

Solution :

We know , average velocity is given by :

Now , time is given by :

So ,

Therefore , the average velocity (km/h) of the car during the full 115 km trip is 29.94 km/h .

Hence , this is the required solution .