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 empt ? ?
a)10 a. m.
b)11 a. m.
c) 4 p. m.
d) 5 p. m.

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.