Answer:D) 1 hr
Step-by-step explanation:
Given
Pump A and B can fill tank in 
Pump A and C can fill tank in 
Pump B and C can fill tank in 
Let A be the total hr taken A therefore rate of 
Let B be the total hr taken B therefore rate of 
Let C be the total hr taken C therefore rate of 
-----1
-----2
-----3
Adding 1,2 & 3



thus time taken by A,B and C combined is 1 hr
AnswerD
Step-by-step explanation:
Answer:
A. 45%=45/100=9/20
Step-by-step explanation:
45% is 45 out of 100 or <em>45/100</em>
9 divided by 20 equals <em>0.45</em>
They are both equal to 45%
The answer would be to 10