Projectile Motion Question

1. The problem statement, all variables and given/known data

If you can hurl a ball so that its initial speed is 30m/s, what is the widest river you can throw it across?

2. Relevant equations
The range equations,
t=2(vi)(sintheta)/g

d=visin2theta/g

3. The attempt at a solution

I know you have to use components so what I got what Vx=30sintheta and Vy=30costheta

I don’t know what to do next or how to sub it in because there isn’t a angle given . Can someone please help me. Thanks

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