Question

F o u r p i p e s fill a t a n k in 1 5, 2 0 , 30 a n d 40 h o u rs
respectively. T h e first pipe wa s o p e n e d at 6 am, the
second at 8 am, the third at 10 am and the fourth at 12
noon. When will the tank get filled completely?

Answer 1

W h y ha v e you w r i tt e n l i ke t h i s ?

Answer 2

http://openstudy.com/study#/updates/512ee556e4b098bb5fbced6f

Refer to the last posting to the above problem.