(b) Water flows into the tank at a rate of 30 litres per minute. Calculate the time taken to fill an empty tank. Give your answer to the whole minute. (1 litre = 1000 cm')

a=24; b=12

step-by-step explanation:

a/b=2: 1

a=2b

36/(1+2)=12

b=12

a=24

step-by-step explanation:

for exempl this   system of equations   y = x - 3

                                                                y = 2x - 5

look   the line : y = x -3     ( red)

                            the line : y = 2x -5 ( bleus)