A Backhoe Can Dig 150 Feet of Trench Per Hour

A backhoe can dig 150 feet of trench per hour and costs $500 per hour to hire and operate.A ditch digger can dig six feet of trench per hour.Based on this information,what is the most a ditch digger can charge per hour when digging ditches?

A) $20 per hour
B) $25 per hour
C) $3.33 per hour
D) $83.33 per hour
E) $500 per hour