Two blocks of masses 4.5 kg and 5.5 kg are connected to the two ends of a light inextensible string passing over a frictionless pulley fixed to a rigid support. At time $t=0$, the blocks are released from rest. The distance travelled by the larger block in a time $t=4$ s is (Acceleration due to gravity $=10\,ms^{-2}$)
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For an Atwood machine:
\[
a=\frac{m_2-m_1}{m_1+m_2}g
\]
and then use standard kinematics equations.