Table:
text: British Rail Class 375
Fleet details
Fleet details
Class_ Type_ Operator_ No_Built Year_Built Cars_per_Set Unit_nos_
Class 375/3 Express & Outer suburban Southeastern 10 2001–2002 3 375301-310
Class 375/6 Express & Outer suburban Southeastern 30 1999–2001 4 375601-630
Class 375/7 Express & Outer suburban Southeastern 15 2001–2002 4 375701-715
Class 375/8 Express & Outer suburban Southeastern 30 2004–2005 4 375801-830
Class 375/9 Express & Outer suburban Southeastern 27 2003–2004 4 375901-927

Question: How many British Rail Class 375s were numbered 375301-310?