Question

Ein Reservoir besitzt zwei Zuleitungen,die erste füllt in 20

Answer 1

a. 1.0 /(1/20 + 1/30) = 12 hours

b. 1.0 - 12/20 = 2/5

(2/5)/(1/30) = 12.0

12.0 + 12.0 = 24.0 hours

c. 8*(1/20) = 2/5

1-(2/5) = 3/5

(3/5) / (1/20 + 1/30) = 7.2

8.0 + 7.2 = 15.2 hours.

巫婆茱莉's answers are all correct.