Traveling in a junlge, you need to rely on your old jeep as you don't have any vehicle fit for the rough terrain of the jungle. Besides a car would simply break when used in such terrain.
Drive your jeep as fast as you can and get to the finish line the soonest. There is a timer in the game so you need to hurry up and get to the finish line. The terrain makes it easy for your jeep to flip on its back, but that is the challenge of the game. Try to get to the finish line without a single scratch.