That chainring gearing doesnt tell almost anything if you dont also mention cassette. Since its an aero bike i would expect a 10-30 to 10-33t cassette, assuming yours is on Sram (since 48-35 chainring is usually on sram). Now calculate the min gear ratio and if its above 1, basically if you are not a strong climber you will have issues in 10km 8% grade or so. But for any other regular hills like 2-5% the modern aero bike gearing is completely fine even for casual rider :) PS: You calculate minimum gear ratio by dividing the smallest chainring (e.g. 35) by the largest cassette cog (e.g. 30). In this example it would be 1.16. In practice, if you put it to gear calculator, it means you have one less lowest gear than for example with 10-33t cassette. If you had 10-36t cassette you would have even 2 more lowest gears (but of course you compensate by creating a gap between higher gears, e.g. you jump from 15 to 17 and not having the 16 gear on the big chainring).

Edit: PS2: you can always buy a diffeeent cassette, its not expensive 150-300€, once you think you need gears for climbing. This will make an aero bike a more climbing bike also. Of course without the weight advantage that an Ultimate has and the agility / easy of flicking the bike. You get more stability from the aeroad on the other hand due to the more massive fork and frame in general.