SrivaniK14 SrivaniK14

12-06-2018
Mathematics

contestada

tap a can till tank in 28 hours, while tap B can fill the same tank in 21 hours. if both taps are open together, how long will it take to fill an empty tank?

Respuesta :

12-06-2018

24.5 hours

28+21=49

49/2=24.5

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