TASK DEFINITION: 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: Problem: a swimmer can swim in still water at 4 km / h . if the speed of the water current is 2 km / h , how many hours will the swimmer take to swim against the current for 5 km ? 
Options: a ) 2.0 , b ) 2.5 , c ) 3.0 , d ) 3.5 , e ) 4.0

SOLUTION: b

PROBLEM: Problem: the sum of three consecutive even numbers is 63 . find the middle number of the three ? 
Options: a ) 14 , b ) 23 , c ) 25 , d ) 29 , e ) 21

SOLUTION: e

PROBLEM: Problem: machine c takes 2 more hours than machine b to make 20 widgets . if working together , the machines can make 25 widgets in 3 hours , how long will it take machine c to make 40 widgets ? 
Options: a ) 5 , b ) 6 , c ) 8 , d ) 10 , e ) 12

SOLUTION:
e