Two pipes A and B can seperately fill a cistern in 60 min. and 75 min. respectively. There is a third pipe in the bottom of cistern to empty it. If all the three pipes are simultaneously opened, then the cistern is full in 50 min. In how much time third pipe alone can empty the cistern.

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Two pipes A and B can seperately fill a cistern in 60 min. and 75 min. respectively. There is a third pipe in the bottom of cistern to empty it. If all the three pipes are simultaneously opened, then the cistern is full in 50 min. In how much time third pipe alone can empty the cistern.

A110 min

B100 min

C120 min

D90 min

Answer:

B. 100 min

Read Explanation:

1/60 + 1/75 - 1/x =1/50 1/x = 1/60 + 1/75 - 1/50 = (5 + 4 - 6)/300 = 3/300 1/x =3/300 х = 300/3 =100 min

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