For a 65 horsepower engine, operate engine at how many RPMs under a no load condition between how many minutes?
a) 1000-1500 RPM, 5-10 minutes
b) 2000-2500 RPM, 15-20 minutes
c) 3000-3500 RPM, 25-30 minutes
d) 4000-4500 RPM, 35-40 minutes