With a uniform speed a car covers the distance in 8 hours. Had the speed been increased by 6 km/hr, the same distance could have been covered in 7 1/2 hours. What is the distance covered?  Choose the correct choice:
A) 187 km
B) 480 km
C) 720 km
D) 297 km
E) 671 km
Let the distance be x km. Then,   x/(7 1/2) - x/8 = 6   2x/15 - x/8 = 6 =&gt; x = 720 km.   Answer:720 km
<result>C</result>
With a uniform speed a car covers the distance in 8 hours. Had the speed been increased by 6 km/hr, the same distance could have been covered in 7 1/2 hours. What is the distance covered?