At exactly the same time Daisy and David both step off a diving platform 5 m high. David jumps off and out from the platform whereas Daisy just takes a step from a standing position. Who will reach the water first?

none of them

Explanation:

the horizontal speed doesn't matter and if i got it right both of them started from the same height and both of them fell to the water (none of the jumped * higher only farther) and that's the only thing that matters. so they'll both end up there at the same time cause only gravity is affecting their movement process among the way.