1 tap can fill a tank in 1 hour, then 4 taps can fille the tank in \(\frac{1}{4}\) hour
i.e, 4 taps fill the tank in 15 minutes. Now the entire task of filling the tank and emptying the tank is completed in 30 minutes. So in 30 minutes, the first 15 minutes were to fill the tank and the rest 15 minutes were to empty the tank.
So 2 taps took 15 minutes to empty the tank, then each tap takes 30 minutes to empty the tank.
30 minutes = \(\frac{1}{2}\) hour
OPTION:
C
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Regards,
Chaitanya
+1 Kudos
if you like my explanation!!!