Two pipes A and B can fill a tank in 6 hours and 9 hours respectively. They are opened alternately for 1 hour each starting with pipe A first. In how many hours the tank will be filled?
A5
B4
C6
D7
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രാമു ഒരു ജോലി 6 ദിവസം കൊണ്ടും രാജു അതേ ജോലി 18 ദിവസം കൊണ്ടും ചെയ്യും. രണ്ടുപേരുംചേർന്നു ജോലി ചെയ്താൽ മുഴുമിക്കാൻ എത്ര ദിവസം വേണം?