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Three taps A, B and C can fill a tank in 12 hours, 15 hours and 20 hours respectively. If all the taps are opened at 12 PM, then at what time (in PM) should the tap A and C be closed to fill the tank completely at exactly 9 PM?1). 62). 43). 34). 7 |
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Answer» From 12 PM to 9 PM = 9 hours So, tap B will work = 9 hours Let tap C and A works x hours According to the question ⇒ x/12 + 9/15 + x/20 = 1 ⇒ (5x + 36 + 3X)/60 = 1 ⇒ 8x = 60 - 36 = 24 ⇒ x = 3 hours So, 12 pm + 3 h = 3 pm |
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