A pipe can fill a reservoir in 20 hr. A drainage pipe can drain the reservoir in 30 hr. How long would it take to fill the reservoir if the drainage pipe were left open by mistake? (Hint: The rate at which water drains should be negative.) Write your answer as an
integer, simplified fraction, or mixed number.
It will take
hr to fill the reservoir.

What is the solution to the system of equations? (–2, –8) (–1, –5) (0, –2) (2, 4)

17 in long 1.3 ft wide and 8in high what is the volume

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%