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'.

[EX Q]: Problem: donovan and michael are racing around a circular 400 - meter track . if donovan runs each lap in 48 seconds and michael runs each lap in 40 seconds , how many laps will michael have to complete in order to pass donovan , assuming they start at the same time ? 
Options: a ) 5 , b ) 7 , c ) 8 , d ) 9 , e ) 6
[EX A]: e

[EX Q]: Problem: if 3 men or 4 women can do a piece of work in 16 days , in how many days can 12 men and 8 women do the same piece of work ? 
Options: a ) 8 / 3 , b ) 6 , c ) 5 , d ) 4 , e ) 3
[EX A]: a

[EX Q]: Problem: in a kilometer race , a beats b by 50 meters or 20 seconds . what time does a take to complete the race ? 
Options: a ) 380 sec , b ) 190 sec , c ) 726 sec , d ) 127 sec , e ) 128 sec
[EX A]:
a