A rocket is moving in a gravity free space with a constant acceleration of `2ms^(-1)` along +x direction (see Fig.5.126). The length of a chamber inside the rocket is 4m. 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 `0.2ms^(-1)` from its right and relative to the rocket. the time in seconds when the two balls hit each other is: