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: working alone , pump a can empty a pool in 6 hours . working alone , pump b can empty the same pool in 9 hours . working together , how many minutes will it take pump a and pump b to empty the pool ? 
Options: a ) 192 , b ) 200 , c ) 208 , d ) 216 , e ) 224
[EX A]: d

[EX Q]: Problem: the sum of 4 consecutive even numbers is 140 . what would be the smallest number ? 
Options: a ) 32 , b ) 88 , c ) 70 , d ) 123 , e ) 12
[EX A]: a

[EX Q]: Problem: in what time will a railway train 90 m long moving at the rate of 44 kmph pass a telegraph post on its way ? 
Options: a ) 3 , b ) 5 , c ) 4.3 , d ) 6.5 , e ) 7.4
[EX A]:
e