Question

Tap A can fill a tank in 16 hours, while tap B can empty the full tank in 20 hours. If both taps are open together, how long will it take to fill an empty tank?

Answer 1

Hi ,

Tap A fill the tank in 16 hours

portion of the tank filled

by tap A in 1 hour = 1/16 ---( 1 )

Tap B empty the tank in 20 hours

portion of the tank emptied

by tap B in 1 hour = 1/20 ----( 2 )

If both taps are open together portion

tank filled by hour = ( 1 ) - ( 2 )

= 1/16 - 1/20

= ( 5 - 4 ) / 80

= 1/80

Therefore ,

Both taps A and B opened together

the tank can be filled in 80 hours.

I hope this helps you.

:)

Answer 2

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