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: some persons can do a piece of work in 12 days . two times the number of these people will do half of that work in ? 
Options: a ) 3 , b ) 4 , c ) 5 , d ) 6 , e ) 8
a

Problem: due to construction , the speed limit along an 7 - mile section of highway is reduced from 55 miles per hour to 35 miles per hour . approximately how many minutes more will it take to travel along this section of highway at the new speed limit than it would have taken at the old speed limit ? 
Options: a ) 2 , b ) 3 , c ) 4 , d ) 5 , e ) 6
c

Problem: find the expenditure on digging a well 14 m deep and of 3 m diameter at rs . 19 per cubic meter ? 
Options: a ) 2998 , b ) 1881 , c ) 2890 , d ) 1485 , e ) 2780

b