SSC Government Jobs Exams Numerical Ability Time and Work

If A works alone, he would take 4 days
more to complete the job than if both A
and B worked together. If B worked alone,
he would take 16 days more to complete
the job than if A and B work together.
How many days would they take to
complete the work if both of them worked
together?

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SSC Other Question

A cistern has 3 pipes A, B and C. A and B
call fill it in 3 and hours respectively, and
C can empty it in 1 hour. If the pipes are
opened at 3 p.m., 4 p.m. and 5 p.m.
respectively on the same day, the cistern
will be empty at 250 men can finish a work in 20 days
working 5 hours a day. To finish the work within 10 days working 8 hours a day,
the minimum number of men required is