when standard speed (6th gear) is 88, what is the rpm?
CREATE TABLE "performance_and_riding_the_mt125_r" (
  "rpm" real,
  "standard_hp" text,
  "standard_torque_lb_ft" text,
  "standard_speed_6th_gear" text,
  "modified_speed_6th_gear" real,
  "modified_hp" text,
  "modified_torque_lb_ft" text
);
SELECT "rpm" FROM "performance_and_riding_the_mt125_r" WHERE "standard_speed_6th_gear"='88';