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(a)60cm*60cm*80cm*1/3=96000cm3

(b) 

96L-10*10L+4*12L=44L

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Hope this answer your question.

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tap A is draining out  whereas tap B should be filling into the tank

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Oh… So sorry. Read the question wrong. 

For my part b working should be
96 000 60 000 = 36 000 
(The water in the tank at 3:06pm)

From 3:06pm to 3:10pm, which is 4 mins (we assume tap A is still on):
Tap A -> 10 000 x 4 = 40 000 (drain)
Tap B -> 12 000 x 4 = 48 000 (fill)

Therefore, from 3:06pm to 3:10pm:
36 000 – 40 000 + 48 000 = 24 000

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