Greenhouse

In the garden the Šťastný family have a greenhouse, next to which there is a 200 litre barrel of water for watering. Per minute, 2.5 litres of water flow from the hose tap. In what time will the whole barrel be filled?
For watering the greenhouse the father needed 6 buckets. Into each bucket 7.5 litres of water fit. How many litres of water remained in the barrel?
For how many minutes did the father have to turn on the tap again if he wanted the barrel to be full again?

Final Answer:

a =  80 min
b =  155 l
c =  18 min

Step-by-step explanation:

$$\begin{gathered} V=200 \\ a=V/2.5=200/2.5=80\text{min} \end{gathered}$$

$$\begin{gathered} V_1=6\cdot 7.5=45 \\ b=V-V_1=200-45=155\text{l} \end{gathered}$$

$c=V_1/2.5=45/2.5=18\text{min}$

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