$3\mathrm{.}7$ Using AOA, diagram the network described below for Lillian Fok$$s construction project. Calculate its critical path and project completion time.

ACTIVITY NODES TIME $($WEEKS$)$ ACTIVITY NODES TIME $($WEEKS$)$

J $1210$ N $342$

K $138$ O $457$

L $246$ P $355$

M $233$