Two pipes A and B can fill a tank in 36 minute and 45 minutes respectively. Another pipes C can empty the tank in 30 minutes. First A and B opened. After 7 minutes C also opened. The tank is filled up in?
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Answer:
46 min
Step-by-step explanation:
pipe A & B can fill the tank in 36 and 45 min respectively . and C can empty in 30 min
capacity of tank is 180 Litre ( LCM of 36 ,45 and 30 )
so efficiency of A = 5
B = 4 &
C = -6 ( negative sign as it empty the tank)
so for 1st 7 min A and B fill the tank
they both fill the tank with 63 litre remaining 117 litre is filled by A B and C so 117 / 3 = 39 min
therefore tank will filled up in 39 +7= 46 min
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