Two racers on one racing bike that has Cofain and the number 5 on it.
The people are riding the bike in a race.
Racers are people. Two racers on one race bike implies they are riding the bike. The fact that they are racers implies they are in a race.
exists e1 s1 x1 x2 x3 x4 x5.(n_number(x5) & n_date(x5) & a_date_day_05(x5) & a_date_day_05(x5) & a_topic(s1) & subset_of(x5,s1) & on(x5,x1) & n_thing(x1) & subset_of(x1,s1) & on(x1,x2) & Actor(e1,x4) & v_cofain(e1) & (x2 = x4) & n_bike(x2) & of(x2,x3) & n_racing(x3) & card_eq_1(x2) & n_racer(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_bike(x2) & n_people(x1) & in(e1,x3) & n_race(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1))