A thief goes away with a SANTRO car at a speed of 45 kmph. The theft has been discovered after half an hour and the owner sets off in a bike at 50 kmph when will the owner over take the thief from the start?  Options:
A) 2 B) 4 C) 7 D) 5 E) 8

Rationale: explanation : | - - - - - - - - - - - 20 - - - - - - - - - - - - - - - - - - - - | 50 45 d = 20 rs = 50 – 45 = 5 t = 20 / 5 = 4 hours answer : option b
Answer: B