Question: What age was the American social entrepeneur who was one of eight who got killed in 2015 when an Amtrak train travelling from Washington, D.C. to New York City derailed?
Related documents: [0]  [DOC] Rachel Jacobs (October 3, 1975 – May 12, 2015) was an American social entrepreneur and CEO of a tech company. She was killed at age 39 in the 2015 Philadelphia train derailment while commuting between her home in New York and the Philadelphia offices of ApprenNet, the educational technology company she had recently joined as CEO. [END] 
[1]  [DOC] On May 12, 2015, an Amtrak "Northeast Regional" train from Washington, D.C. bound for New York City derailed and wrecked on the Northeast Corridor in the Port Richmond neighborhood of Philadelphia, Pennsylvania. Of 238 passengers and 5 crew on board, 8 were killed and over 200 injured, 11 critically. The train was traveling at 102 mph in a 50 mph zone of curved tracks when it derailed. [END] 
Answer: 
39
39