Asked by Grace

A 600L water tank is full to the top. One day, it started leaking at a rate of 15L per hour, when it was half way, water is added at a rate of 20L per hour, how long will it take for the tank to be full again?
Answered by oobleck
time to drain halfway: 300/15 = 20 hr
time to fill back up: 300/5 = 60 hr
Answered by Grace
Thanks for your response, but according to my teacher it's 80 hours. Could you please see why that is the answer.
Answered by oobleck
well, 20+60=80
I guess she started counting when the tank started to leak...
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