A salesman travels a distance of 100 km in 5hours. How much faster in kilometer per hour, on an average, must he travel to make such trip in 1 hour less time? Choices
A) 2km/hr
B) 3km/hr
C) 5km/hr
D) 7km/hr
E) 10km/hr
Time required = 5 hrs- 1hr = 4hr   Required speed = 100/4= 
<gadget id="calculator">100/4</gadget>
<output>25</output>
25km/hr   Original speed= 100/5= 
<gadget id="calculator">100/5</gadget>
<output>20</output>
20 km/hr   Difference= 25-20= 
<gadget id="calculator">25-20</gadget>
<output>5</output>
5 km/hr   Answer is 5km/hr
<result>C</result>
A salesman travels a distance of 100 km in 5hours. How much faster in kilometer per hour, on an average, must he travel to make such trip in 1 hour less time?