Hi, there are two time missions that can't be beaten with its recommended vehicles.
This:
(However, I managed to beat it just by choosing faster vehicle.)
And this:
This one's trickier, because I couldn't beat it with the big boat either – it can't pass the bridge:
I found out that even if I somehow get past the bridge with the recommended little boat, I couldn't get to this checkpoint since it is too far with practically no time left (time with little boat not a helicopter in the picture):
I only managed to beat it with a helicopter.