(30 2007 P2
9,+ water vendor has a tank of capacity 18 900 litres. The tank is being filled with water
from two pipes A and B which are closed immediately when the tank is full. water flows at the rate of 150000cm cubed per minute through pipe A and 120000cm cubed per minute through B.
a)if the tank is empty and the 2pipes are opened at the same time, calculate the time it takes to fill the tank
b)On a certain day the vendor opened the two pipes A and B to fill the empty tank. after 25 minutes he opened the outlets tap to supply water to his customers at an
+verage rate of 20 litres per minute.

Calculate the time it took to fill the tank on that day.
if The vendor supplied a total of 542 jerricans, each containing 25 litres of
on that day. If the water that remained in the tank was 6 300 litres, calcu
in litres, the amount of water that was wasted.​