How many hours to pump 30 000 litres , flow rate will be 80 liter per minute ? ?

To pump 30,000 liters at a flow rate of 80 liters per minute, you would need to pump for 375 minutes.

Calculation:
30,000 liters / 80 liters per minute = 375 minutes

Therefore, it would take 375 minutes or 6 hours and 15 minutes to pump 30,000 liters at a flow rate of 80 liters per minute.

1. Convert the flow rate to liters per hour:
80 liters per minute = 80 x 60 = 4800 liters per hour

2. Calculate the number of hours to pump 30,000 liters:
Number of hours = Volume (liters) / Flow rate (liters per hour)
Number of hours = 30,000 liters / 4800 liters per hour
Number of hours = 6.25 hours

Therefore, it will take 6.25 hours to pump 30,000 liters at a flow rate of 80 liters per minute.