Bibhav,
Usain Bolt has run the 100meters sprint in 9.58 seconds. That means about 37.5 kmph. Considering that an elephant is estimated to be running between 30 to 40 kmph speed, you can't outrun an elephant.

The other question is the vegetation. An elephant can just brush aside all bushes in its path and maintain its speed. We can't. So unless you are in a man made road, it is a hopeless case.

People think that they can run behind trees and avoid the elephant. An IFS officer in Bandipur had tried that to his misfortune. It is simply not easy.

Just try to run for a few feet and hide. The elephant would hear you though you may not think so. D:

One solution is to run fast and climb a big tree. However, I am not sure how all the city bred wildlife photographers will fare in tree climbing.

Cheers,
Sabyasachi