Points for recapitulation while solving problems
on time and work:
1. If a person can do a piece of work in ‘m’
days, he can do 1/m of the work in 1 day.
2. If the number of persons engaged to do a piece
of work be increased (or decreased)
in a certain ratio the time required to do the same work will be decreased (or
increased) in the same ratio.
3. If A is twice as good a workman as B, then A
will take half the time taken by B to do a certain piece of work.
4. Time and work are always in direct proportion.
5. If two taps or pipes P and Q take ‘m’ and ‘n’
hours respectively to fill a cistern or tank, then the two pipes together fill
part
of the tank in 1 hour and the entire tank is filled in
.