Question

Jessica and Franklin are volunteering to paint one of their community member’s fences for service hours. If Jessica could complete the job in 6 hours and Franklin could complete the job in 4.5 hours, how long would it take them to complete the job together, to the nearest minute?

Select one:
a.
2 hours and 34 minutes

b.
2 hours and 44 minutes

c.
2 hours and 57 minutes

d.
3 hours and 16 minutes

Answer 1

@beccaboo333

Answer 2

I'm not entirely sure how to do this.. Sorry :/ @ganeshie8

Answer 3

@whpalmer4 @apoorvk @thomaster

Answer 4

@iPwnBunnies @yellowlegoguy99

Answer 5

Means, Jessica completes (1/6) of the work alone in 1 hour, and Franklin completes (1/4.5) of the work in one hour.

So, together, in ONE HOUR, together they can complete (1/6) + (1/4.5) of the work.

Reciprocal of that would give the time they will need to complete the work together.

Answer 6

i got 1/27 @apoorvk

Answer 7

Incorrect.
Re-calculate:
\[\frac16 + \frac1{4.5}\]

Answer 8

oh 7/18

Answer 9

@ganeshie8 @ganeshie8 @ganeshie8 @ganeshie8

Answer 10

do you know what to do?

Answer 11

\(\large \dfrac{1}{6} + \dfrac{1}{4.5} = \dfrac{1}{x}\)


\(\large \dfrac{7}{18} = \dfrac{1}{x}\)


\(\large \dfrac{18}{7} = x\)

Answer 12

2.57 so that's 2 hours and 57 minutes?

Answer 13

nvm it is

Answer 14

nope

Answer 15

its approximates 2 and HALF hours

Answer 16

how much is 2 and HALF hours ?

Answer 17

2.57 hours


2 hours + 0.57 hours

2 hours + 0.57*60 minutes

2 hours + 34 minutes

Answer 18

So, it is `2 hours and 34 minutes` okay ?

Answer 19

oh ok n ow I get it I didn't know you had to multiply .57 by 60

Answer 20

yes we need to cuz :

\(0.57 \) hours is NOT same as \(57\) minutes

Answer 21

\(0.57\) is approximately HALF an hour... so you should get around \(30\) minutes