[填空题]
Protons are injected i 7vwnpi:r7x am.wt1g(nto the 1.0-km-radius Fermilab Tevatgn, ix k;(o1cy;)fgemron with an energy of 150 GeV. If they are accelerated by 2.5 MV each revolutionn,;e y ) co;kg(mxif1g, how far do they travel and approximately how long does it take for them to reach 1.0 TeV? d$\approx $ $ \times 10^9\ \text{m}$
