SECTION B. SULV MIL A tank can be emptied by one pipe in 30 minutes and another pipe in 20 minutes. When the tank is 2/3 full , how long will it take to empty it when both pipes are open?​

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step-by-step explanation:

yx = 36

step-by-step explanation:

cos f = opposite side/ hypotenuse

cos f = yw / yx

we know cos f = 4/9 and yw =16

4/9 = 16/yx

multiply each side by yx

4/9 yx = 16/ yx * yx

4/9 yx = 16

multiply each side by 9/4

9/4 * 4/9 yx = 16 *9/4

yx = 36