a spotlight is placed on the ground, and shines on a wall 12 metres away. spot is an 75cm tall dog who walks at a speed of 1.

a spotlight is placed on the ground, and shines on a wall 12 metres away. spot is an 75cm tall dog who walks at a speed of 1.6m/s. spot walks from the spotlight directly towards the wall, projecting a shadow onto the wall. when spot is 9 metres from the wall:

A)how high is his shadow on the wall

B)how fast is the length of his shadow decreasing