A pilot of a Mitsubishi A6M Zero fighter aircraft with a power of P=940hp was flying horizontally over an atoll belonging to the United States of America at speed v=180kn. When the pilot spotted the runway with aircrafts attempting to take off, he pulled the triggers of both 7.7mm fixed-mounted Type 97 aircraft machine guns with a cadence of c=900min−1 and a muzzle velocity of u=745m⋅s−1. Each of the machine guns had one full belt of ammunition with 500 rounds. If the pilot flew exactly over the runway that was l=7800ft long, how many rounds did he hit it with?