There are three drains in a 6-meter-deep reservoir of water. to lower the water level by 2 meters it takes drain a 2 hours, drain b 3 hours, and drain c 4 hours. if all three drains are opened at once, how long will it take to empty the reservoir?

answer: 1inch=7days  

12inch=12*7=84days

step-by-step explanation:

you estimate that the angle of elevation to the top of the 86th floor (the observatory) is 82 .the total height of the building is another 123 meters above the 86th floor.

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if the rectangular pool has a area of 192 square ft. and length of 15 ft. you must divide 15 into 192. 192 ÷ 15 = about 13 ft.