the rocket stage burn time less than 324.0 applies to which rocket engine?
Entity Entity Entity Entity Entity
m.03g0k4 m.05sp7jj m.034_q7 m.034_44 m.02xlvv5
Merlin Aestus Rocketdyne J-2 Rocketdyne F-1 RD-171
class class literal
spaceflight.rocket_engine spaceflight.rocket_stage 324.0^^http://www.w3.org/2001/XMLSchema#float
spaceflight.rocket_engine spaceflight.rocket_stage type.float
Rocket engine Rocket Stage 324.0
none none <=
spaceflight.rocket_engine.used_in_rocket_stages spaceflight.rocket_stage.burn_time
Used in rocket stages Burn Time
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :spaceflight.rocket_engine . 
?x1 :type.object.type :spaceflight.rocket_stage . 
FILTER (?x2 <= "324.0"^^<http://www.w3.org/2001/XMLSchema#float>)
?x0 :spaceflight.rocket_engine.used_in_rocket_stages ?x1 . 
?x1 :spaceflight.rocket_stage.burn_time ?x2 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND spaceflight.rocket_engine (JOIN spaceflight.rocket_engine.used_in_rocket_stages (le spaceflight.rocket_stage.burn_time 324.0^^http://www.w3.org/2001/XMLSchema#float)))