a flooded by area is pumped dry in 45 minutes using three idential pumps; if one of the pumps failed to work, how long would it takrs to pump the area city?
If it takes three identical pumps 45 minutes to pump the flooded area dry, it means that each pump takes 45 minutes to do the job on its own. Therefore, if one pump fails to work, it would take two pumps to complete the job.
Since each pump takes 45 minutes, two pumps will take half the time to complete the job.
Therefore, it would take 45 minutes รท 2 = 22.5 minutes for two pumps to pump the city area dry.