$5-$ The two columns shown are $4070cm.$ Line $AB$ is the property line. The allowable net soil pressure is $1\mathrm{.}35k\frac{g}{c}m2$ and the thickness of plain concrete $=20$ cm $.$ You are required to suggest suitable footing and give the dimensions of the suggested system $($only length and width $($don$\text{'}$t design$))$ for the following two cases:

a$.p1=90t$ and $p2=135t$

b$.p1=80t$ and $p2=70t$