A car moves with constant velocity along a straight road. Its position is \(x_{1}=0 \mathrm{~m}\) at \(t_{1}=0 \mathrm{~s}\) and is \(x_{2}=30 \mathrm{~m}\) at \(t_{2}=3.0 \mathrm{~s}\). Answer the following by considering ratios, without computing the car's velocity.

a. What is the car's position at \(t=1.5 \mathrm{~s}\) ?

b. What will be its position at \(t=9.0 \mathrm{~s}\) ?