In 6 cylinder engine rpm how many times open inlet valve per minute?

In a 6-cylinder engine, each cylinder typically has one intake valve. If the engine is running at a certain RPM (revolutions per minute), the intake valves open and close once for each cycle of the engine. Since a four-stroke engine completes one cycle every two revolutions, the intake valves open 3 times per revolution for all 6 cylinders. Therefore, at 3000 RPM, the inlet valves would open 9000 times per minute (3000 RPM x 3).