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Agata [3.3K]
3 years ago
10

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?
Mathematics
1 answer:
geniusboy [140]3 years ago
5 0

Answer:

30 minutes

Step-by-step explanation:

Nathaniel can weld 1 rail in 75 minutes, so he welds 1R = 75 min,  and Brenda can weld 1 rail in 50 minutes (25 minutes faster than Nathaniel), so she welds

1R = 50 min

We want to see how many minutes it takes them both, so we need to solve both problems for the minute unit

Nathaniel:  (1/75)R = 1 min   (he can do one seventy-fifth of a rail per minute)

Brenda:  (1/50)R = 1 min (she can do one fiftieth of a rail per minute)

notice, the equation is 1/(minutes it takes them), and we want to see how long it takes both of them, so we get the equation:

1/75 + 1/50 = 1/x

Simplify the left side with common denominator of 57(50) = 3750

We get

125/3750 = 1/x

We can cross multiply to get rid of the fractions...

125x = 3750

Divide both sides by 125 to solve for x...

x = 30, so it would take them 30 minutes to weld a rail if they work together.

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Comment
|First of all, the triangles are equal by ASA the way the diagram has been marked.

B and E are both right angles.
Side BC = Side DE
<BCA =< EDA 

So triangle BCA = triangle EDA

Now to the letters.
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