Question

water flowing in a river is measured to have an average flow rate of 3 cubic meters per hour.
conversions
1 cubic meter = 1000 liters
1 hour = 60 minutes
what is the flow rate of the river in liters per minute?
a. 0.18 liters per minute
b. 1.8 liters per minute
c. 5 liters per minute
d. 50 liters per minute

Explanation:

Step1: Convert cubic meters to liters

The flow rate is 3 cubic meters per hour. Since 1 cubic meter = 1000 liters, we multiply 3 by 1000 to get the liters per hour.
$3 \text{ cubic meters/hour} \times 1000 \text{ liters/cubic meter} = 3000 \text{ liters/hour}$

Step2: Convert hours to minutes

We know that 1 hour = 60 minutes, so we divide the liters per hour by 60 to get liters per minute.
$\frac{3000 \text{ liters/hour}}{60 \text{ minutes/hour}} = 50 \text{ liters/minute}$ Wait, no, wait, let's check again. Wait, 3 cubic meters per hour. 31000=3000 liters per hour. Then divide by 60 minutes: 3000/60 = 50? Wait, but let's check the options. Wait, maybe I made a mistake. Wait, the flow rate is 3 cubic meters per hour? Wait, no, maybe the original problem was 3 cubic meters per hour? Wait, no, let's re - calculate. Wait, 3 cubic meters per hour. 1 cubic meter is 1000 liters, so 3 cubic meters is 31000 = 3000 liters per hour. Then per minute, we divide by 60: 3000/60 = 50? But option D is 50 liters per minute. Wait, but let's check again. Wait, maybe the flow rate is 3 cubic meters per hour? Wait, maybe I misread. Wait, the problem says "average flow rate of 3 cubic meters per hour". Then conversions: 1 cubic meter = 1000 liters, 1 hour = 60 minutes. So to convert to liters per minute: (3 cubic meters/hour) (1000 liters/cubic meter) / (60 minutes/hour) = (31000)/60 = 3000/60 = 50 liters per minute. So the answer is D.
Wait, but let's check the options again. Option D is 50 liters per minute. So that's correct.

Answer:

D. 50 liters per minute