Answer:
b
Step-by-step explanation:
Answer:
0.88 s
Step-by-step explanation:
Let x(t) be the volume of nitric acid measured in liters after t minute. Therefore the rate of change in the volume of nitric acid (dx / dt) is:
dx / dt = rate of input of nitric acid - rate of output of nitric acid
rate of input of nitric acid = 6 L/min * 20% nitric acid / 100% solution = 1.2 L/min
rate of output of nitric acid = 8 L/min * x L / 200 L = 0.04x L/min


The percentage of nitric acid in the tank reach 10% at 0.88 s
75-25=50
50/75= 66.67% decrease
Answer:
OP = 5 units
Step-by-step explanation:
Centroid of a triangle divides the median in the ratio 2 : 1
Therefore,
AO : OP = 2: 1
Let AO = 2x and OP = x
Since, AO + OP = AP
So, 2x + x = 15
3x = 15
x = 15/3
x = 5
Since, OP = x
Therefore, OP = 5