Hi
DPratimaThe reproduction of questions encountered in GMAT is forbidden as per the confidentiality agreement digitally signed by the test takers.
let me still guide you on the concept to answer such question.
First of all you have the rate at which the water is leaking out of these two rectangular tanks which will help you estimate the rate at which the height of water level in respective tanks dropping.
i.e. volume decrease in tank 1 \(= 2 cm^3 = l*b*h\) (of tank 1) since we know l and b therefore we can calculate drop in height
suppose the rate of height drop in Tank 1 = x cm/min
and the rate of height drop in Tank 2 = y cm/min
where x > y
then assume after t mins the height of one cuboid be half of the other
i.e. height drop of Tank 1 after t mins = xt
i.e. height drop of Tank 2 after t mins = yt
i.e. remaining heights of water level in tanks, \(2*(h_1-xt) = (h_2-yt)\) where \(h_1\) and \(h_2\) are heights of tank 1 and tank 2 tespectively
I hope this helps!
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