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For this type of question, pls ask the simple question to yourself if the answer should be more or less than 4 min.

If volume of tank is u cm³,

rate of water flow out from tap A = u/4 cm³/min

rate of water flow out from tap B = u/5 cm³/min

So rate of water flow out when both tap A and B turn on = u/4 + u/5 cm³/min

time taken for tap A and tap B both turn on to fill the tank = u/ (u/4 + u/5) min

= 1 /( 1/4 + 1/5)  min

= 20/9 min

= 2 2/9 min

 

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