One person can do a certain job in twenty-one minutes, and another person can do the same job in twenty-eight minutes. How many
minutes will it take them to do the job together?
6 min
12 min
24 min
2 answers:
Answer: 12 min
Step-by-step explanation:
Given: Time taken by one person to do a job = 21 minutes
Time taken by another person to do a the same job = 28 minutes
If they work together then the total time taken by both of them to complete the job is given by :-

Hence, they will take 12 minutes to do the job together.
You might be interested in
1. $9.00
2. Sorry, I don't understand this problem
3. Ally Cat because it is $1 cheaper
20+25x=35+18x
x=1 month
x=15/7
Answer:
7/8
its between 3/4 and 1
Step-by-step explanation:
think quarters
.50,.75, 1, 1.25
(1/2, 3/4, 1, 1 1/4)
good luck!!
Answer:
cot(x)
Step-by-step explanation:



Recall the Pythagorean Identity 
<span>0.66666666666 is the answer</span>