Question

Please Help will give medal!

Frankie can build a speaker box in 120 minutes.
Tisha can build a speaker box 40 minutes faster. If they work together, how many minutes does it take them to build the speaker box?

Answer 1

I think it's B

Answer 2

There are no options but ok:

x/120 +x/40 =1
x +3x =120
4x=120
x=30 minutes

\[\frac{ x }{ 120 } + \frac{ x }{ 40 } = 1\]
x + 3x = 120
4x = 120
x = ?

Answer 3

x = 30

Answer 4

Yeah.

Answer 5

It's not one of the choices, I'm confused.

Answer 6

anyone? please help?

Answer 7

@Hi-xx @hughfuve @pandaecat @bruno102 @gabbimanges17 @The_Yee_Dinosaur @ctwatson @ximevazq @dwoodruff

Answer 8

1. The amount of time it will take when they work together will be less than the time it takes Tisha to do it alone.

2. To find the time it takes for Frankie and Tisha to build the speaker together, let
F = the time it takes Frankie to build the speaker alone
T = the time it takes Tisha to build the speaker alone

Then input those values into the following expression:

\[\dfrac{F \times T}{F + T}\] and then evaluate the expression.

Answer 9

It's 30 but that's not the answer the choices are

40 minutes

48 minutes

80 minutes

240 minutes

Answer 10

If it were me, I'd pick the lowest amount. 40 could be a typo.

Answer 11

Alright I'll try...

Answer 12

It was wrong. :(

Answer 13

If that's wrong, then the other choices are more wrong.

Answer 14

30 is definitely the right amount of minutes.