To fill a tank, tubes P, Q and R take 10 minutes, 7.5 minutes and 6 minutes respectively. The time in minutes that the tubes together will take to fill the tank is:

5 mins

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2.5 mins

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7.5 mins

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2 mins

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4 mins

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Solution

The correct option is B
2.5 mins

(P+Q+R) 1 min work = $\frac{1}{10} + \frac{2}{15} + \frac{1}{6} = \frac{2}{5}$

Total time taken tofill the tank by three tubes together = $\frac{5}{2}$ = 2.5 min

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To fill a tank, tubes P, Q and R take 10 minutes, 7.5 minutes and 6 minutes respectively. The time in minutes that the tubes together will take to fill the tank is:

The correct option is B 2.5 mins (P+Q+R) 1 min work = 110+215+16=25 Total time taken tofill the tank by three tubes together = 52 = 2.5 min

The correct option is B
2.5 mins

(P+Q+R) 1 min work = $\frac{1}{10} + \frac{2}{15} + \frac{1}{6} = \frac{2}{5}$

Total time taken tofill the tank by three tubes together = $\frac{5}{2}$ = 2.5 min