1.

Four pipe A, B, C and D can fill a cistern in 20, 25, 40 and 50 hours respectively. The first pipe A was opened at 6:00 am, B at 8:00 am, C at 9:00 am and D at 10:00 am. When will the cistern be full ?

Answer»

`4:18` PM
`3:09` pm
`12:15` pm
`11:09` am

Answer :B


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