A diver jumps with an upward velocity of 2.0m/s, from a 10m diving board. How long will it take to hit the water?(answer: 1.6s).

There is the answer but how do I get it?

how long does it take to decellerate to 0m/s?
how high is the diver when he reaches 0m/s?
how long does it take to hit the water?

These can all be answered easily with the SUVAT equations.