Saved Bookmarks
| 1. |
Two pipes p and qcan fill a tank in 10 hours and 12 hours respectively and r can empty the tank in 6 hours.If pipes p,q,r are opened at 7 am,8 am, and 11 am respectively. then when the tank will be full of water? |
|
Answer» ⇒Pipe A opens at 8 am. it fins 4 units/hr ⇒ Pipe A fills 4×3=12unit in 3 HRS So by 11 am. it fills 12 units SIMILARLY ⇒ Pipe B opens at 9 am. it fills 5 units/hr ⇒ By 11 am it fills 5×2=10 units total water in tank till 11 am =12+10=22 units ⇒ Now, 11 am onwards all pipes work simultaneously INCLUDING emptying pipe. ⇒ (A+B+C) EFFICIENCY is 4+5−15=−6 units ⇒ now 6 unit will be emptied per hour then Tank will be emp TIED at after ⇒ the tank will be emptied at ⇒ 11am+3hrs40min. ⇒ 2 : 40pm |
|