Name the number of clock rate mhz when bandwidth mb/s is 2400
CREATE TABLE "module_specifications" (
  "designation" text,
  "bus_width_bits" real,
  "channels" text,
  "clock_rate_m_hz" real,
  "bandwidth_mb_s" real
);
SELECT COUNT("clock_rate_m_hz") FROM "module_specifications" WHERE "bandwidth_mb_s"=2400;