A rocket is moving in a gravity free space with a constant acceleration of $$2 ms^{-2}$$ along +x direction (see figure). The length of a chamber inside the rocket is 4 m. A ball is thrown from the left end of the chamber in +x direction with a speed of $$0.3 ms^{-1}$$ relative to the rocket. At the same time, another ball is thrown in -x direction with a speed of $$0.2 ms^{-1}$$ from its right end relative to the rocket. The time in seconds when the two balls hit each other is