Tanker

The first pump can empty an oil tanker in 4.9 hour. The second pump can empty a tanker in 8 hours. If the first pump started at 4:00 and the second 1.4 hour later, at what time will the tanker be empty?

Correct answer:

t =  3.6 h

Step-by-step explanation:

4.91t+81(t1.4)=1  t=4.9+84.98+1.44.9=3.6 h=3:34



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