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# A particle moves in a straight line with a constant acceleration. It changes its velocity from $10 \: ms^{-1}$ to $12 \: ms^{-1}$ while passing through a distance 135 m in $t$ second. The value of $t$ is :

$\begin {array} {1 1} (1)\;9 & \quad (2)\;10 \\ (3)\;1.8 & \quad (4)\;12 \end {array}$