SOLUTION: sam can paint a wall in 20 minutes. Jerry can paint the same wall in 30 minutes. How long will it take them to paint the wall wheb they work together.
please tell me how to solve
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please tell me how to solve
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Question 904719: sam can paint a wall in 20 minutes. Jerry can paint the same wall in 30 minutes. How long will it take them to paint the wall wheb they work together.
please tell me how to solve it also.
Thank you.
You can put this solution on YOUR website! 1/a+1/b=1/x
1/20+1/30=1/x
30/600+20/600=1/x
50/600=1/x
x=600/50
x=12 minutes working together
check
x/a+x/b=1
x/20+x/30=1
12/20+12/30=1
0.6+0.4=1
1=1
ok
