A child standing on a ladder of 7.0m drops two stones 1.00s apart into a pool of

A child standing on a ladder of 7.0m drops two stones 1.00s apart into a pool of water noting that only a single splash of water is made. If the first stone has an initial speed of 1.30 m/s.
(a) How long did it take the two stones to hit the pool of water after the first stone was dropped?
(b) What is the initial velocity of the second stone?
(c) What is the final velocity of each stone?