Soal SMP · Soal cerita · Kesulitan 3/5
A worker can complete a job in 12 days. After working for 3 days, he is joined by another worker who can do the same job alone in 6 days. How many more days are needed to finish the job?
- A.3 days
- B.4 days
- C.2 days
- D.5 days
Kunci jawaban & pembahasan
Jawaban: 3 days
Work done in 3 days = 3/12 = 1/4; remaining = 3/4. Combined rate = 1/12 + 1/6 = 1/4 per day; time = (3/4) ÷ (1/4) = 3 days.
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