Question

Un robinet umple in 10 ore , a doilea robinet umple in 15 ore . Aflați in cite ore vor umple amândoi robineții bazinul .?

Answer 1

15-10=5 ore
Cred ca asa este

Answer 2

Răspuns

6 ore

Explicație pas cu pas:

robinet 1 ..........10 ore.......1 bazin

robinet 2 ..........15 ore.......1 bazin

robinet 1 ..........30 ore.......3 bazine

robinet 2 ..........30 ore.......2 bazin

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robinet 1+2 ........30 ore.......3+2=5 bazine

robinet 1+2 vor umple  1 bazin in  30 :5= 6 ore