If you complete a job in 20 minutes, the same job your brother completes in 30 minutes. Then you both complete the same job together?
Solution:
You complete a job: 20
minutes
your completes the same job:
30 minutes
You both complete the same
job: ???
∴ 1/20+
1/30
Take L.C.M of 20 and 30 will be 60
3/60+2/60
∴ 3+2=5
5/60
1/12
you and your brother will
complete the job in 12 minutes
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