The amount of time that three people worked on a special project was in the ratio of 1 to 2 to 3. If the project took 120 hours, how many more hours did the hardest working person work than the person who worked the least?
Choose the correct choice from the following answers:
A) 35 hours  B) 40 hours  C) 36 hours  D) 38 hours  E) 42 hours
Let the persons be A, B, C.   Hours worked:   A = 1*120/6= 
<gadget id="calculator">1*120/6</gadget>
<output>20</output>
20 hours   B= 2*120/6= 
<gadget id="calculator">2*120/6</gadget>
<output>40</output>
40 hours   C= 3*120/6= 
<gadget id="calculator">3*120/6</gadget>
<output>60</output>
60 hours   C is the hardest worker and A worked for the least number of hours. So the difference is  60-20= 
<gadget id="calculator"> 60-20</gadget>
<output>40</output>
40 hours.   Answer : 40 hours
<result>B</result>
The amount of time that three people worked on a special project was in the ratio of 1 to 2 to 3. If the project took 120 hours, how many more hours did the hardest working person work than the person who worked the least?