Two diggers

There are two diggers. One digger digs a pit 46 hours second gidding 2 times faster.

a) how long took to dig a pit second digger
b) how long took dig together

Correct result:

a =  23 h
b =  15.33 h


a=46/2=23 h
b(146+1a)=1 b=1146+246=15.33 h

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