A thief steels a car at 8a.m. and drives it at 50kmph. The theft is discovered at 9a.m. and the owner sets off in another car at 70 kmph. When will he overtake the thief?
Choices
A) 9a.m.  B) 9.30a.m.  C) 1130a.m.  D) 11.45a.m.  E) 10.15a.m.
Suppose the thief overtakes x hours after 8a.m.   Distance covered by the thief in x hrs = distance covered by the owner in (x-1 hours)   50x = 70(x-1)   20x = 70   x = 7/2 hrs   Thief is overtaken at 11.30a.m.   Answer is 1130a.m.
<result>C</result>
A thief steels a car at 8a.m. and drives it at 50kmph. The theft is discovered at 9a.m. and the owner sets off in another car at 70 kmph. When will he overtake the thief?