With a uniform speed a car covers the distance in 8 hours. Had the speed been increased by 4 km/hr, the same distance could have been covered in 7 1/2 hours. What is the distance covered?  Pick:
A) 400 km
B) 480 km
C) 490 km
D) 380 km
E) 330 km
B   480 km   Let the distance be x km. Then,   x/(7 1/2) - x/8 = 4   2x/15 - x/8 = 4 =&gt; x = 480 km.
<result>B</result>
With a uniform speed a car covers the distance in 8 hours. Had the speed been increased by 4 km/hr, the same distance could have been covered in 7 1/2 hours. What is the distance covered?