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How to use vector components when finding resultant velocity?!?

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1. Hey guys, this is Q4 from the June 14 AQA m1b paper:

I'm really stuck on how components are used in this question - why do we use 20/sin(70) to find time? This doesn't make any sense to me
2. (Original post by Serine)
Hey guys, this is Q4 from the June 14 AQA m1b paper:

I'm really stuck on how components are used in this question - why do we use 20/sin(70) to find time? This doesn't make any sense to me
Haven't really looked at it, but maybe the sine rule?
3. (Original post by Zacken)
Haven't really looked at it, but maybe the sine rule?
Thanks for the response I get why and how to use sine rule for the latter part of the question. I just don't understand why, to use the speed =d*t equation for a) that I need to use sin(70)*2 for velocity?

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