Question

It would take Nina 5 hours to move all the demolished bricks into the dumpster by herself. Together, Nina and Otis can move all of them in 3 hours. How fast could Otis move all the bricks by himself to the nearest tenth of an hour?

a. 0.1 of an hour
b. 0.2 of an hour
c. 7.5 hours
d. 8.0 hours

Answer 1

@perl

Answer 2

i think option C is correct !!

Answer 3

@justsmile531 am i correct here ?? i mean can you check answer of this question

Answer 4

I will let you know when I finish my quiz . I still have more questions to answer ; ughh I hate Algebra

Answer 5

please tag me if you know the answer,then i can explain you how to solve this question

Answer 6

okk.. @justsmile531

Answer 7

You were correct

Answer 8

thanks !!!

Answer 9

Solution :-
\[\large \bf \frac{1}{3}=\frac{1}{5}+\frac{1}{x}\]
after simplify,you get
x=15/2=7.5