Answer:
150 minutes
Step-by-step explanation:
P.S - The exact question is - 
Given - This is the pond in a shape of a prism, it is completely full of 
              water. Colin uses a pump to empty the pond. The level goes 
              down by 20 cm in the first 30 min.
To find - Work put how many minutes Colin has to wait for the pond 
                to completely empty.
Proof - 
Given that,
Height of prism = 1 m
Also,
Base of the prism is trapezium and
Sides of the trapezium are 0.6 m and 1.4 m
Height of trapezium is 2 m
We know that,
Area of trapezium =  × (sum of sides)× height
× (sum of sides)× height
                              =   × (0.6 + 1.4)× 2
× (0.6 + 1.4)× 2
                              =   × (2)× 2
× (2)× 2
                              =  2 m²
⇒Area of trapezium = 2 m²
Now,
Volume of prism = Area of trapezium × height of prism
                           = 2 m² × 1 m
                           = 2 m³
⇒Volume of prism = 2 m³
Now,
Given that the level goes down by 20 cm in the first 30 min
We know
100 cm = 1 m
⇒1 cm =  = 0.01 m
 = 0.01 m
⇒20 cm = 20×0.01 m = 0.2 m
⇒The level goes down by 0.2 m in the first 30 min.
Also,
we know that height of water = height of prism = 1 m
So, the remaining water left in the pond = 1 m - 0.2 m = 0.8 m
Also,
Volume of Remaining water = Area of trapezium × height 
                                            = 2 m² × 0.8 m
                                            = 1.6 m³
⇒Volume of Remaining water = 1.6 m³
Now,
Volume of emptied water = Total Volume - Volume of Remaining water
                                        = 2 m³ - 1.6 m³
                                        = 0.4 m³
⇒Volume of emptied water = 0.4 m³
Now,
0.4 m³ water will be empty in 30 minutes
⇒ 1 m³ water will be empty in  = 75 minutes
 = 75 minutes
⇒1.6 m³ water will be empty in 1.6 × 75 = 120 minutes
∴ we get
The remaining water is empty in 120 minutes
So,
Total pond is empty in 120 + 30 minutes
⇒Total pond is empty in 150 minutes