Question 330822
each day, working individually each person completes 

Lambo 1/4 of the project/day
Tazaru 1/(4/2) = 1/2  of the project/day
Nosaru 1/2  of the project/day
Knuckle 1/(1/4)=4 of the project/day

Together:  L+T+N+K = complete 1/x of the project
so.......   1/4+1/2+1/2+4=1/x
or 21/4=1/x therefore  x=4/21 of a day if all work together

similar concept fo the rest of your questions