It takes one machine 25 minutes to pick a bale of cotton and another machine 30 minutes to compete the same job. If both machines are used, how long will it take them to pick a bale of cotton?

Answer 1

rate of first machine = 1/25
rate of 2nd machine = 1/30
combined rate = 1/25 + 1/30 = 11/150

time at combined rate = 1/(11/150) = 150/11
or appr 13.6 minutes

Answer 2

Yes

Answer 3

The rate of machine #1: X/25

The rate of machine #2: X/30
Equation: X/25 + X/30 = 1
* 6X/150 + 5X/150 = 1
* 11X/150 = 1
* 11x = 150
* x = 150/11
* x = 13.63...
* x = 13.64
It takes both machines 13.64 minutes to pick a bale of cotton.

Answer 4

this is wrong

Answer 5

13.64!!!

Answer 6

13.(63) meaning that (63) is repeating forever

Answer 7

guys, its 150/11, it won't be right if it's 13.64 or 13.6

Answer 8

I agree with Bob

Answer 9

13.64 is right

Answer 10

1/25
1/30
1/25 + 1/30 = 11/150
150/11= 13.(63)= 13.64
hope this helps

Answer 11

I agree with sup

Answer 12

I do agreement with sup