Про скорости в фильме:
The required changes of velocity, roughly c/3, are 100,000 kilometers per second (per second, not per hour!).
By contrast, the most powerful rockets we humans have today can reach 15 kilometers per second: seven thousand times too slow. In Interstellar, the Endurance travels from Earth to Saturn in two years at an average speed of 20 kilometers per second, five thousand times too slow. The fastest that human spacecraft are likely to achieve in the twenty-first century, I think, is
300 kilometers per second. That would require a major R&D effort on nuclear rockets, but it is still three hundred times too slow for Interstellar’s needs.
Fortunately, Nature provides a way to achieve the huge speed changes, c/3, required in Interstellar: gravitational slingshots around black holes far smaller than Gargantua.