Fill in the Blanks

Short Answer

Fill in the blanks. $\begin{array} { l } \hline \text { Pulley A } \quad\quad\quad\quad\quad\quad { \text { Pulley B } } \\\begin{array} { | l | l | l | l | } \hline \text { Diameter } & \mathrm { rpm } & \text { Diameter } & \mathrm { rpm } \\\hline 20 \mathrm {~cm} & 90 & 30 \mathrm {~cm} & \\\hline \mathrm {~in} &40 & 8 \mathrm {~cm} & 20 \\\hline\end{array}\end{array}$