Xavier worked 10 hours on monday and 15 hours on wednesday. his total pay was 280.00 what is his rate per hour

The answer is B, $11.20.
 
Number of hours worked on Monday = 10 hours
Number of hours worked on Tuesday = 15 hours
Total pay received by Xavier = $280
Total number of hours worked  = (10 + 15)=25 hours
                                                                
Rate per hour = 280/25 dollars per hour
                     
 11.2 dollars per hour (B)

Hope this helps! :)