Soal SMA · Soal cerita · Kesulitan 2/5

A water tank is filled by pipe A in 6 hours and by pipe B in 4 hours. If both pipes are opened together, how long will it take to fill the tank?

A.2.4 hours
B.2.5 hours
C.3 hours
D.2 hours

Kunci jawaban & pembahasan

Jawaban: 2.4 hours

Combined rate = 1/6 + 1/4 = 5/12 tank/hour. Time = 12/5 = 2.4 hours.

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