Answer:
36hrs
Step-by-step explanation:
Let the older pump be "a" and the newer pump be "b"
3a = b
3a + b = 9
We simply put the value of b from equation 1 into equation 2
3a + (3a) = 9
6a = 9
a = 1.5
If a = 1.5
3(1.5) = 4.5
b = 4.5
If a and b do it in 9hrs, it means they both contribute 4 parts to each hour's progress. 60minutes/4 = 15minutes a part.
So the new pump does in 15minutes what the old pump does in 45minutes
Ratio 3:1 = 4 NB: ratio 3 is for the new pump because it is 3 times as efficient.
So the old pump working alone will require 9*4 = 36hrs
Area= length x width. The triangles bottom length equals 6 because the side above is 15, meaning 4+5+6=15. You multiply 9 and 15 to get 135
The number is not large enough to round to the 10000
5,10,15,20,25,30,35,40,45,50,55,60
6,12,18,24,30,36,42,48,54,60
10,20,30,40,50,60
The answer is 60
