Nathaniel can weld a railing in 75 minutes. Brenda can weld a railing 25 minutes faster. If they work together, how many minutes does it take them to weld the railing?

Question

anonymous · Answer

@Loser66

loser66 · Answer

your idea?

anonymous · Answer

I would do like 1/75+1/25=1/x

anonymous · Answer

bcuz 100 min. isn't an answer choice lol

loser66 · Answer

For Nathaniel, he needs 75 min to finish the job. That is in 1 minute, he finishes 1/75 part of the job, right?
Same as Brenda with 1/25 
so that in 1 minute, both them will finish $\dfrac{1}{75}+\dfrac{1}{25}= \dfrac{4}{75}$ part of the job. 
Summary:   1min------------4/75
                    ? min-----------75/75??

anonymous · Answer

50 ??

loser66 · Answer

nope 75/4 = 72 minutes + 3/4 minutes. That is 72minutes 45seconds

anonymous · Answer

25 minutes
 30 minutes
 50 minutes
 150 minutes

anonymous · Answer

Those are the answers. I have no idea what to do

loser66 · Answer

oh!!@ sorry 75/4 = 18 + 3/4

anonymous · Answer

:) It's okay hahha

loser66 · Answer

But it is just 18 minutes 45seconds which is not one of the options. ha!!

anonymous · Answer

lolll I thought so too! So I guess it would be 25 min.???

loser66 · Answer

I don't guess but don't know what is wrong with the logic. Ok, let's get help @ganeshie8  Please, explain me what is wrong.!!

anonymous · Answer

Lol thank-you :D

ganeshie8 · Answer

`Nathaniel can weld a railing in 75 minutes. Brenda can weld a railing 25 minutes faster.`

That means Brenda can finish the work in `50` minutes right ?

ganeshie8 · Answer

so we must be solving 
$$\dfrac{1}{75}+\dfrac{1}{50} = \dfrac{1}{x}$$

loser66 · Answer

YYYYYYYYYYYES

anonymous · Answer

:) I agree. So would it be 50 min.?

anonymous · Answer

Guys?

ganeshie8 · Answer

what is 50 ?

anonymous · Answer

No idea. Thanks @ganeshie8 and @Loser66  :) !!!!!

loser66 · Answer

hehehehe..... no idea??? That is we are cheated by you??