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A woman on a bridge 75.0m high sees a raft floating at a constant sped on the river below

A woman on a bridge 75.0m high sees a raft floating at a constant sped on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 7.00m more to travel before passing under the bridge. The stone hits the water 4.00m in front of the raft. Find the speed of the raft.
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Answer #1
Use the same method described here:
http://www.jiskha.com/display.cgi?id=1230441164

The raft moves 3.0 m in the time it takes the stone to fall 75 m. Compute that time and do the division to get speed.
answered by: Simukeliso trevor buthelezi
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Answer #2
I didn't get how did she got 4.29s
answered by: Latianna
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Answer #3
YEAH! I got it already. THANKS!
answered by: malina
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