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If there are variables in the question substitute them with numbers and try to solve.

At a certain printing plant each of m machines print 6 newspapers in every s seconds. If all machines work together and independently without interruption
How many minutes will it take to print 1800 newspapers?
a) 180 s / m
b) 50 s / m
c) 50ms
d) ms / 50
e) 300 m / s

Solution:
Let m = 2 and s = 1
Since each of m machines prints 6 newspapers in s seconds
So 2 machines prints 2*6 newspapers in 1 second
That is 12*60 newspapers in one minute.
720 ------------ 1 minute
18000 ---------?
18000 / 720 = 25

Substitute m = 2 and s = 1 in all the choice and find the answer.

OR

=> X = (18000 * s / 60) / 6m
=> X = 50 s / m