three boys can finish filling up a tank o water in 2 hours. How long will 4 boys take to do the same job?
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Answer:
160 min or 2.6 hours
Step-by-step explanation:
1 hour = 60 min
2 hours = 120 min
one boy will take __ time = 3/120=40
∴ 4 boys will take = 40 × 4 =160
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