Question

Three pipes A,B and C, fills a drum in 5 hours, 15 hours and 20 hours respectively. (A)If all the taps are open, in how many hours will the drum be filled? (B) If tap A and tap B are closed after 7/2 hours, how much time will tap C take to fill the remaining work?​

Answer 1

Answer:

a) 20+15+5 = 40 hours

b) 3 hours 30 minutes

b)) 34 hours it will take bcz 5- 3.5= 1.5, 15-3.5= 12.5, 12.5+1.5+20= 34

Step-by-step explanation:

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Answer 2

Given :-

• Taps A, B and C will fill 1/5, 1/15 and 1/20 part of drum.

Solution :-

★ In 3 1/2 hours, pary of drum filled is -

• ➡ Drum filled = 3.5 × (1/5 + 1/15)

• ➡ Drum filled = 14/15 part

• ➡ Remaining 1 - 14/15 = 1/15th drum.

★ Time required to fill remaining drum by C is -

• ⏲ Time = (1/15) / (1/20)

• ⏲ Time = 4/3 hours

• ⏲ Time = 1 hr 20 min

Therefore,

• C will take 1 hr 20 min ⌚ to fill remaining drum.

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