A water tank can be filled in 5 minutes and emptied in 9 minutes.?
Question:If the drain is accidentally left open when the tank is being filled, how long does it take to fill the tank?
a. 11.25 min
b. 20 min
c. 28 min
d. 4 min
Answers:
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The answer is 11.25 minutes.Since,
the tank is filled in 5 minutes,1/5 part is filled in 1 minute.
the tank is emptied in 9 min, 1/9 part is filled in 1 min.
sinced thier subraction will be the total part filled in 1 min,
1/5 -1/9=4/45
therefore the tank will be filled in 45/4=11.25 min.
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