Question

If water is flowing at 30 liters per second and the drain is draining at 20 liters per second how long will it take starting from 10000to get to 12000 liters

Answer 1

200 seconds

Explanation:

If the income of water is 30 liters per second and the outcome is 20 liters per second, we have that the increase in water is:

30 - 20 = 10 liters per second

So, if the starting point is 10000 liters and the final point is 12000 liters, the increase in the amount of liters is:

12000 - 10000 = 2000 liters

If our net income is 10 liters per second, it will take 2000/10 = 200 seconds to get from the starting to the final point.

Answer 2

t = 2000 ÷ 10 = 200 seconds

Time taken to reach end point t = 200 seconds

Explanation:

Given;

Rate of inflow = 30 liters per second

Rate of draining = 20 liters per second

Rate of overall inflow = 30 - 20 liters per second = 10 liters per second.

Starting point = 10000 liters

End point = 12000 liters

Change in volume = 12000-10000 = 2000 liters

Time taken to reach end point t = change in volume ÷ rate of overall inflow

t = 2000 ÷ 10 = 200 seconds

Time taken to reach end point t = 200 seconds