Question

a tap can fill a tank in 1 hours . Another tap can same tank in 30 minutes. if the both thw taps are open then time taken by them to fill tha tank is. ?
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Answer 1

Answer:

A fills 1/90 of the tank per minute. B fills 1/60 of the tank per minute.

Together, they fill 1/90 + 1/60 = 5/180 of the tank per minute. The tank is filled in 180/5 = 36 minutes

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Answer 2

If tap a+b=3000lites=60 min with tap a 1000liter per hour and tap b 2000 lit per hour then time to full the tank with two taps together will be =1000x60/3000=20 min