Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate hours and if pipe A is opened first, in how many hours, the tank shall be full ?

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Satt Academy · Accepted Answer

5 - (A  +  B) ' 2 hours work  when open d  =  1/6   +  1/4  =  5/12
(A  +  B) 4 hours work when open  =  5/12   ×  2  =  5/6
Remaining work  1 -  5/6  =  1/6 
Now,  its A turn in 5th hour
1/6 work will be done by A in 1 hour
Total time  =  4  +  1  =  5 hours

Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate hours and if pipe A is opened first, in how many hours, the tank shall be full ?

নল ও চৌবাচ্চা (Pipes and cistern) টপিকের বিষয়বস্তুঃ

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