Question

A completes a job in 20 min and B in 30 mins, if they do the same job together how much time will they take?

Answer 1

Step-by-step explanation:

Amount of work done by A in 1 minute= 1/20

Amount of work done by B in 1 minute= 1/30

Total work done by A and B together in 1 minute= (1/20) +(1/30)= 5/60

Therefore,

Time taken by A and B together to finish the work together = 60/5= 12 minutes

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Answer 2

Answer:25 MINUTES

Step-by-step explanation:

A DO FOR 20/2

=10

B DO FOR 30/2=15

A+B=10+15

=25

HENCE PROVED