Two diggers

There are two diggers. One digger digs a pit 77 hours second gidding 1.2 times faster.

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

Correct answer:

b =  64.17 h
s =  35 h

Step-by-step explanation:

a=77 h b=a/1.2=77/1.2=64.17 h
s (1/a+1/b)=1 s (1/77+1/64.166666666667)=1  2.2s=77  s=35=35 h

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