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1/10+1/12-1/20=12+10-6/120=16/120
time=120/16=7½hr
let tank capacity =lcm of 12,10,20=120
pipe A 1 hr me bhrta h=120/12=10
pipeB=120/10=12
and pipe C nikalta h=120/20=6
1 ghante me.bhrega teeno ke chalne pr=10+12-6=16 ltr
120 ltr bhrega=120/16=7.5 hr=7 hr 30 min
time=120/16=7½hr
let tank capacity =lcm of 12,10,20=120
pipe A 1 hr me bhrta h=120/12=10
pipeB=120/10=12
and pipe C nikalta h=120/20=6
1 ghante me.bhrega teeno ke chalne pr=10+12-6=16 ltr
120 ltr bhrega=120/16=7.5 hr=7 hr 30 min
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