In a 100 m race,A covers the distance in 30 seconds and B in 45 second.In this race A beats B by :  Choose the correct choice from the following
A) 33.33 m
B) 25 m
C) 45 m
D) 30 m
E) none of these

Rationale: solution distance covered by b in 15 sec . = ( 100 / 45 x 15 ) m = 33.33 m . ∴ a beats b by 33.33 metres . answer a
Answer: A