Help, Im new to physics

Jun 2019
I just started to teach myself physics online, i dont really know where to start. I have this question though, help would be appreciated! :)

A biker moves 7.5m/s, when he reaches a downhill he starts to accelerate with 2.3m/s2

A) How long does it take until the biker reaches 55 km/h?

B)How long has the biker reached after riding 3 sec down the hill?

C)How much speed does the biker have at the end of the hill if its 59m long and we can assume that the acceleration is constant?

Sorry for my bad English
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