You will be given a definition of a task first, then some input of the task.
In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Passage: Italian driver Elio de Angelis who had joined Brabham after six years with Lotus, was the first driver to die in a works Brabham when he was killed in an accident while testing at the Circuit Paul Ricard in France. The car survived the accident relatively intact and de Angelis had only minor injuries. However, there were very few track marshals at the circuit and he was trapped in the car and killed by oxygen deprivation due to a fire before they arrived, prompting a review of testing safety, with changes including more marshals as well as medical staff and a required medical evacuation helicopter. Sadly de Angelis would die from smoke inhalation 29 hours after the crash at the hospital in Marseille where he had been taken. In the Belgian Grand Prix following the death of de Angelis, Brabham only entered one car for Patrese. From the next race in Canada, British driver Derek Warwick joined the team. According to team boss Bernie Ecclestone, Warwick, a former factory Renault driver who had been driving for the TWR Jaguar World Sportscar Championship team in 1986 after having missed out on a seat at Lotus, was reportedly the only top level driver without a current F1 drive who did not contact him in the days following de Angelis' death to ask about the drive.
Link Information: Tom Walkinshaw Racing (TWR) was a motor racing team and engineering firm founded in 1976, Question: How long had the TWR Jaguar World Sportscar Championship team been in existence when Elio de Angelis joined it?
Output:
Answer: 10