Four pipes can fill a reservoir in 15, 20, 30 and 60 hours respectively. The first pipe was opened at 8 am second at 9 am third at 10 am and fourth at 11 am. When will the reservoir be full? `1\ pdotmdot` b. `2\ pdotmdot` c. `2. 30\ pdotmdot` d. `3\ pdotmdot`

Two pipes can fill a tank with tank with water in 15 and 12 hours respectively and a third pipe can empty it in 4 hours. If the pipes be opened in order at 8,9 and 11a.m. respectively the tank will be emptied at 11 : 40 adotmdot b. 12 : 40 pdotmdot c. 1: 40 pdotmdot d. 2: 40 pdotmdot

A thief steals a car at 2.30 p.m. and drives it at 60 kmph. The theft is discovered at 3 p.m. and the owner sets off in another car at 75 kmph. When will he overtake the thief? 4. 30 pdotmdot b. 5 pdotmdot c. 4. 45 pdotmdot d. 5. 15 pdotmdot

Two pipes A and B can fill a tank in 12 hours and 16 hours, respectively. While a third pipe C emptied the full tank in 24 hours. If all the three pipes are operate Simultaneously at 7 am. In what time tank will be filled?

A cistem can be filled by two pipes A and B 4 hours and 6 hours respectively. When full , the tank can emptied by a third pipe C in 8 hours. If all taps are turned on at the same time the cistern will be full in ?