In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: mars travels around the sun at a speed of approximately 15 miles per second . the approximate speed is how many miles per hour ?
Options: a ) 48,000 , b ) 51,000 , c ) 54,000 , d ) 57,000 , e ) 60,000
c