Water is being pumped to empty a swimming pool.
At 6 a.m., the water level is 150 cm. Every 2 hours, the water level drops by 30 cm.
What is the earliest time when the pool will be empty?
A. 10 a.m.
B. 11 a.m.
C. 4 p.m.
D. 5 p.m.
Answer (2)
to empty the pool, you need to lower the water level by 150cm. since you can only lower it by 30cm every 2 hours (also same as 15 cm per hour), that means it will take you 10 hours.
150cm*(2 hours)/(30cm) = 150*(1/15) = 150/15 = 10.
6 a.m. + 10 hours = 4 p.m.
So the answer is C.) 4 p.m.
The swimming pool will be empty at 4 p.m. after a total of 10 hours of water being pumped out. This is calculated from an initial water level of 150 cm and a drop rate of 30 cm every 2 hours.
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