In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: the perimeter of a semi circle is 122 cm then the radius is ? 
Options: a ) 17 , b ) 28 , c ) 24 , d ) 11 , e ) 12
c

Problem: a can do a work in 8 days . b can do the same work in 16 days . if both a & b are working together in how many days they will finish the work ? 
Options: a ) 3 days , b ) 16 / 3 days , c ) 3 / 4 days , d ) 9 / 12 days , e ) 5 / 7 days
b

Problem: a boat having a length 3 m and breadth 2 m is floating on a lake . the boat sinks by 1 cm when a man gets into it . the mass of the man is : 
Options: a ) 50 kg , b ) 60 kg , c ) 70 kg , d ) 80 kg , e ) none of these

b